The knight raises a sword at the harpy.  Before they can fight, two more toads touch each other and transform: 42 109

The other two toads transform into a ghast and a swarm of poisonous snakes.

Knight's initiative: 8

Ghast's initiative: 18

Harpy's initiative: 5

Snakes' initiative: 24

Spark's initiative: 20

Chuul's initiative: 18

Rizo initiative: 11

Spark makes another batch of Magic Stones and launches two at the harpy.

Attack: 25 Damage: 13

Attack: 18 Damage: 10

The harpy is damaged, but alive.  It flies 10 feet into the air and begins singing, forcing Spark, Rizo, and the knight (and Minty if he's still here) to make a DC 11 Wisdom saving throw.

Spark's Wisdom save: 21

Knight's Wisdom save: 18

Unfazed by the harpy's song, the knight swings his sword at the ghast.

Attack: 20 Damage: 9

Attack: 20 Damage: 8

The ghast is badly injured.  The chuul, still powered up by strange fruits, tries to finish it off.

Attack: 23 Damage: 12

Attack: 12 Damage: 18

The ghast is dead.  There is still a probably friendly knight, a harpy flying in the air, and some snakes that seem riled up but don't seem to be targeting anyone in particular.

It is Rizo's turn.

Wis save dc 11: 10

Rizo transforms his magical staff into a Shillelagh and casts Green-Flame Blade on the swarm of snakes.

Attack: 19 Damage: 8 magical bludgeoning plus 2 Fire damage

Minty's save ((Sorry stopped getting notifications for some reason then one suddenly showed up.)):  15 

Minty's initiative:  10 

When it is appropriate to do so, Minty will fire a shot at the Harpy.

Attack: 16 Damage: 25 

Elven accuracy die: 24 

Rizo's staff kills a few snakes, but the remaining ones turn and attack him.

Attack: 15 Damage: 9 and a DC 10 Constitution save to avoid an additional 13 poison damage.

Edit: I didn't see Minty's post.  Since Minty did enough damage to kill the harpy, Spark will attack the snakes instead.

Attack: 11 Damage: 10

Attack: 15 Damage: 10

Minty's crossbow bolt knocks the harpy out of the sky.  Rizo and Spark's combined attacks kill a lot of the snakes, but there are some left.

The knight swings his greatsword at the snakes.

Attack: 14 Damage: 10

Attack: 11 Damage: 10

The chuul tries to finish off the remaining snakes.

Attack: 25 Damage: 14

Attack: 30 Damage: 21

The chuul easily crushes the last of the snakes.  The knight salutes the party and walks off.

"There are still six toads left.  Do you want to try to get the rest of them to transform?"

Rizo throws a few more bits of a ration into their midst. Ini: 16

This time, all of the remaining toads try to eat the rations, and bump into each other and transform. 35 90 9 24 55 79 44

Gold Dragon Wyrmling's disposition (1 = friendly, 2 = hostile): 2

Hell Hound's initiative: 11

Gorgon's initiative: 4

Allosaurus's initiative: 10

Air Elemental's initiative: 25

Giant Ape's initiative: 9

Gold Dragon Wyrmling's initiative: 14

Rug of Smothering's initiative: 14

Spark's initiative: 3

Chuul's initiative: 15