Chromir finally gets a hit in on the bog man. 21 to hit (not including Bless, but hits anyway), for 7 damage. Chromir then roars in his face, daring him to stay and take another hit.

"Oh this is a fine place for a dwarf Doc smiles" Before swinging his hammer again:

to hit: 9 for 6 dmg.

Realizing the insane lizardman who obviously was a terrible animal trainer, was running away, Navrine quickly ran through the rough terrain using half movement of 20 feet flanking the Cockatrice. Using the same non-lethal approach strikes out at the little devil trying to knock it out rather than kill it out right. “We have to support Stone feather, let me try and knock this devilish monstrosity unconscious so it doesn't turn us to stone!” Navrine lashes out with controlled unarmed strikes to attempt to subdue the horrid little beast.

Movement: 20’ (difficult terrain) Should be able to flank C2.
Action: unarmed strike, (1, +5) 6 for a miss.
Bonus Action: unarmed strike, (14 +5) 19 to hit if it hits 5 points of non-lethal bludgeoning damage.

Cassian nods. "Yes, let's knock it out and get m-moving!" He aims at the cockatrice with a non-lethal swing of his blade. He will then lay a hand on Navrine to bolster her health for the battle ahead.

Action: Longsword to hit on cockatrice 12, damage 8 non-lethal slashing

Bonus Action: Lay on Hands on Navrine for 5 Hp

After completely missing that first attack on that horrid little beast, Navrine felt her self-doubt rising, then the pain of her wounds easing a bit, as she felt the warm healing glow course though her. “Thanks Cassian, Sorry I missed that horrid little beast!”

The shambling mound reared up, its hulking form towering over the bog. With a thunderous roar, it brought down two of its massive, vine-like limbs upon one of the summoned crocodiles.

It was too much for the summoned crocodile, its form dissipating into a cloud of mist ... the summoning magic allowing retreat back to wherever it was that it had been called from.

On the periphery of the chaos, the last remaining cockatrice flapped its wings frantically, squawking in terror as it flew away into the dense swamp. The final bogman, battered and demoralized, followed suit, hopping clumsily into the muck.

The paladin laid a gauntleted hand on Navrine's shoulder, channeling the last of his divine power to heal her wounds.

Meanwhile, Doc and the Frog Prince continued their bitter duel. The cleric swung his warhammer with all his might, but the wily amphibian leapt clear, croaking a guttural laugh. Seizing the opening, the Frog Prince lunged forward, its slimy jaws clamping down on Doc’s arm with surprising strength, its mocking voice echoed across the battlefield.

"HA! DWARF BLOOD TASTES SWEET!"

Init - PC [HP]; Conditions & Effects; Actions
22 - Chromir [17/29hp]; Blessed; Reckless attack vs B3, a hit! (7hp slashing damage)
18 - Navrine [12/17hp]; Move, Two unarmed strikes vs C2, one hits! (5hp bludgeoning damage)
-> Only the vegetation (& water) is considered difficult terrain. Navrine's movement did not cross through any vegetation/water and was not penalized.
16 - Cassian [15/23hp]; AC20; Longsword vs C3, a miss! BA: Lay on Hands (+5hp to Navrine)
03 - Doc [07/19hp]; Blessed; Warhammer vs Frog Prince, a miss!
-> The Bless 1d4 was not included (it wouldn't have held this attack as it missed by 6, just mentioning it becasue it was not clear if it was forgotten or not included on purpose.
-> Last round, Doc was struck by the Frog Prince and took damage.
-> This prompted a Concentration check (which I forgot to ask for)
-> I rolled a Concentration check for Doc prior to summarizing this round, it passed!
-> On this round, Doc was bit again, please roll a Concentration check, DC10.

Init — Name, AC, HP [hp inflicted]; Conditions & Effects; Actions
10 — Shambling Mound, AC15, 136hp [28hp], two slam attacks vs C4, both hit! 11 & 7 Bludgeoning damage, killing it.
08 — Frog Prince, AC15, 52hp [47hp], Lance and bite vs Doc, the bite hits! (7hp piercing damage)
08 — Bog Men, AC15, 11hp
B2 — [10hp] Wis save or flee, a failure! The Bogman disengages!
03 — Stone Feather, Move & Dash
03 — Cockatrice, AC11, 27hp
C2 — [5hp] Wis save or flee, a failure! The Cockatrice disengages! 
03 — Crocodiles, AC12, 13hp
C1 — Bite vs SM, a miss!
C2 — Bite vs SM, a hit! (5hp piercing damage)
C3 — Bite vs SM, a hit! (9hp piercing damage)
C4 — Dead

Ongoing Effects
Cassian — Concentrating, Shield of Faith, 10 minutes
Cassian — Antitoxin (adv on saves to avoid/end the poisoned condition), 1 hour remaining
Doc — Concentrating, Bless, 6 rounds remaining
Stone Feather — Concentrating, Conjure Animals, 1 hour remaining
Chromir — Rage, 10 minutes remaining

-The hillocks are 10' tall and will require 10' of climbing/jumping to get down.
-All vegetation and water on the lower level counts as difficult terrain.
-Enough large creatures have trampled through the area in the middle (cattails), it is still difficult terrain, but that area is no longer heavily obscured.

Seeing the little monster retreating in fear warms Navrines heart as much as Cassian's healing power. “I was scared too, little monster, I’m glad one of us had some sense.”   Turning to Cassian, Navrine says “It looks Like Doc could use some help, I will join you at the mound after Doc and I kill the Prince, Maybe he can pass you the Fire potion?” That said Navrive take 40 feet of movement toward Doc and the ‘Prince Frog Boy’ and attacks:

Movement: 40’ 
Action: unarmed strike, (19, +5) 24 to hit. if it hits 9 points of bludgeoning damage.
Bonus Action: unarmed strike, (5 +5) 10 to hit, probably  a miss.

Cassian gives a small smile at Navrine's words to the retreating monster before growing serious again as he nods. "Sounds l-like a plan. I'll see you there." He gives a determined expression before turning and dashing after Stone Feather.

Action and movement: Dash, running long jump 14 ft into cattail forest. Acrobatics not to go prone on landing in difficult terrain: 16. He will use his remaining movement to get as close to the SM and Stone Feather as possible (within 5 ft of each being the goal).

"Well, it will be the last taste of dwarf you get" Doc answers the frog prince as sees a bit of flesh taken from his arm before swimming his hammer again he takes a healing potion healing for 9hp.

To hit 10 for 11 dmg.

The tide of battle shifted as Navrine and Doc turned their full attention to the Frog Prince.  Navrine darted in with precision strikes.  Doc followed up with a crushing swing of his warhammer, the weapon striking true and caving in the Frog Prince's chest.

The vile creature let out a final, gurgling croak before collapsing into the mud, its reign of cruelty ended.

Across the bog, Cassian sprinted through the trampled cattails, the swampy ground sucking at his boots. As he reached the massive crocodile that was Stone Feather’s shape-shifted form, the paladin leapt onto its scaled back! The lizardfolk shaman, understanding Cassian’s intent, surged forward, bore the paladin toward the shambling mound.

Together, rider and mount presented a formidable sight, their combined might directed at the monstrous foe.

The terrible plant beast showed no signs of relenting. Its massive, vine-wrapped limbs slammed into the nearest crocodile with devastating force, reducing another one of the summoned beasts to a dispersing mist. 

Though only one enemy remained, the heroes knew the battle was far from over. The towering shambling mound loomed overhead — death incarnate — its every movement filled with primal malice.

Init - PC [HP]; Conditions & Effects; Actions
22 - Chromir [17/29hp]; No action (Chromir declared no actions this round and may take two actions next round)
18 - Navrine [12/17hp]; Move, Unarmed Strikes vs Frog Prince, one hits! (9hp bludgeoning damage, dropping the Frog Prince to 0hp remaining)
16 - Cassian [15/23hp]; AC20; Move & Dash
03 - Doc [16/19hp]; Warhammer vs Frog Prince, a hit, killing it! Drink potion of healing (+9hp)
-> Last round, Doc was struck by the FP and I called for a Concentration check.  It looks like you forgot to throw the dice for this so I rolled one for you, a failure.  Doc dropped his concentration on Bless after being struck and it was not active this round.

Init — Name, AC, HP [hp inflicted]; Conditions & Effects; Actions
10 — Shambling Mound, AC15, 136hp [28hp], Slam attack vs C1, a critical hit! (24 bludgeoning damage, killing C1), a Slam attack vs C2, a miss!
08 — Frog Prince, AC15, 52hp [52hp], Dead 
-> Navrine brought the FP to 0hp remaining, the FP became unconscious. 
-> The FP began its turn with 0hp remaining and rolled a Death Saving Throw, a failure!
-> Later in the round, Doc attacked the Frog Prince (with adv due to unconscious & prone).  A hit! (critical hit due to attacking an unconscious, prone creature w/i 5') (critical hits = 2 death saving throw failures)
-> With three Death Saving Throw failures, the Frog Prince dies!
03 — Stone Feather, Bite vs Shambling Mound, a miss!
03 — Crocodiles, AC12, 13hp
C1 — Dead
C2 — Bite vs SM, a miss!
C3 — Bite vs SM, a miss!

Ongoing Effects
Cassian — Concentrating, Shield of Faith, 10 minutes
Cassian — Antitoxin (adv on saves to avoid/end the poisoned condition), 1 hour remaining
Stone Feather — Concentrating, Conjure Animals, 1 hour remaining
Chromir — Rage, 10 minutes remaining

-The hillocks are 10' tall and will require 10' of climbing/jumping to get down.
-All vegetation and water on the lower level counts as difficult terrain.
-Enough large creatures have trampled through the area in the middle (cattails), it is still difficult terrain, but that area is no longer heavily obscured.

Doc jumps from the cliff and moves forward throwing a javelin at the end of his turn:

To hit: 17 for 9 dmg.

(My bad for forgetting conc check, sorry!)

Cassian clings tightly to the back of the crocodile as it surges through the muck, a part of him marveling at the thrill of riding such a fearsome creature. But that wonder is quickly forgotten as they near the Shambling Mound. The monstrosity’s hulking form radiates malice. He swings his blade at the writhing vines, but his inexperience with mounted combat shines through as he misses completely.

Action: Longsword to hit 6

Navrine smiles as she sees Cassian jumping on Stonefeathers shapeshifted form and tells Doc “I guess we should give Cassian the title ‘Beast Rider’ from now on!” Jumping down the hillock she charges toward the shambling mound.At the end of her moment she does a flying scissor kick at the large mound of vegetation.

Movement: 40’
Action: Dash 40’
Bonus Action: (If close enough) unarmed strike, (16, +5) 21 to hit. if it hits 8 points of bludgeoning damage.

Chromir will dash up to the mound (35ft movement, so just makes it with the dash due to difficult terrain), using his following rounds action to swing his greataxe recklessly. 17 to hit, for 9 slashing damage.

"Weeds stand no match against us!"

The heroes rallied! Each of them striking at the towering Shambling Mound.

Navrine darted in, her powerful kick connecting with a tangle of vines, causing the creature to lurch. Chromir, roaring in fury, brought his greataxe down in a brutal arc, slicing through the dense mass of vegetation. Doc followed suit, hurling a javelin that buried itself deep within the creature’s writhing form. Each blow tore through the Shambling Mound, weakening it.

Cassian, still astride Stone Feather in his crocodile form, swung his longsword with all his might, but the strike glanced off the mound’s tough, shifting surface. 

The Shambling Mound lashed out with a pair of vine-like appendages, aiming to crush Stone Feather beneath its tremendous strength. Cassian’s shield, however, was interposed it just in time ... deflecting the pair of deadly blows!  

Stone Feather, undeterred in his crocodilian form, lunged forward. His powerful jaws clamped down around the Shambling Mound, teeth sinking into the writhing vegetation. With a mighty twist of his neck, the lizardfolk shaman restrained the creature, pinning it in place. The Shambling Mound struggled against the crushing grip, but the crocodile’s strength held firm, leaving it vulnerable to the heroes’ next assault.

Init - PC [HP]; Conditions & Effects; Actions
22 - Chromir [17/29hp]; Move & Dash, Greataxe vs SM, a hit! (9hp slashing damage)
18 - Navrine [12/17hp]; Move & Dash, Unarmed Strik vs SM, a hit! (8hp bludgeoning damage)
16 - Cassian [15/23hp]; AC20; Longsword vs SM, a miss!
03 - Doc [16/19hp]; Move, Javelin vs SM, a hit! (9hp piercing damage)

Init — Name, AC, HP [hp inflicted]; Conditions & Effects; Actions
10 — Shambling Mound, AC15, 136hp [65hp], Targets Stone Feather ...
-> This triggers Cassian's Protection fighting style, attacks against Stone Feather will be made at disadvantage
-> Two slam attacks vs Stone Feather, both miss!
03 — Stone Feather, Bite vs SM, a hit! (7hp piercing damage), the bite starts a grapple!
-> The SM is Grappled & while grappled, is also Restrained
03 — Crocodiles, AC12, 13hp
C2 — Bite vs SM (w/ adv), a miss!
C3 — Bite vs SM (w/ adv), a hit! (4hp piercing damage)

Ongoing Effects
Cassian — Concentrating, Shield of Faith, 10 minutes
Cassian — Antitoxin (adv on saves to avoid/end the poisoned condition), 1 hour remaining
Stone Feather — Concentrating, Conjure Animals, 1 hour remaining
Chromir — Rage, 10 minutes remaining

-The hillocks are 10' tall and will require 10' of climbing/jumping to get down.
-All vegetation and water on the lower level counts as difficult terrain.
-Enough large creatures have trampled through the area in the middle (cattails), it is still difficult terrain, but that area is no longer heavily obscured.

Successfully deflecting the massive monstrosity's blows sends a surge of relief through Cassian. Seeing the SM restrained in Stone Feather's jaws, he strikes again with renewed confidence.

"Keep it up! We can do this!"

Action: Longsword to hit with advantage 22, damage 9 slashing

Chromir, (able to attack with advantage without reckless attack this round) aims to be more careful to swing and not hit stone feather. He is too careful however and hits the floor instead. He grunts in frustration.