Croaker Murkmage

Amphibious. The frog can breathe air and water.

Slippery. The croaker has Advantage on checks and saves against being Grappled or Restrained.

Bite. Melee Attack Roll: +5, reach 5 ft. Hit: 10 (2d6 + 3)Bludgeoning damage and, if the target is Medium or smaller, it is Grappled (escape DC 13). While Grappled in this way, the creature is also Blinded.

Bile Spray (recharge 5-6). DC 12 Dex save, each creature in a 15-foot Cone. Failure: 10 (3d6) Acid damage and the creature is Blinded until the end of its next turn. Success: Half damage only.

Spell casting. The croaker casts one of the following spells, requiring no Material components and using Intelligence as the spellcasting ability (spell save DC 12):
1/Day Each: Grease, Magic Missile, Ray of Sickness

Grasping Tongue. DC 13 DEX or STR save (target’s choice), one Medium or smaller creature the croaker can see within 15 feet. Failure: The creature is pulled to the nearest unoccupied space within 5 feet of the croaker and falls Prone.

Leap. The croaker jumps up to its Speed without provoking Opportunity Attacks.

Commanding Croak. Trigger: A Friendly creature the croaker can see within 30 feet makes a D20 Test. Response: The creature adds +1d8 to the roll.

Wart Burst. Trigger: The croaker takes non-Psychic damage. Response: Each other creature within 5 feet of the croaker takes 4 (1d8) Poison damage and must succeed on a DC 12 CON save or be Poisoned until the end of its next turn.

Has 3 Boss Actions:

Cacophonous Command. Each of up to 5 croakers within 30 feet who can hear the croaker has Advantage on the next D20 Test it makes before the end of its next turn.

Murky Step. The croaker magically teleports to an unoccupied space it can see within 30 feet and is Invisible until the start of its next turn.

Stinking Sovereign. The croaker casts Stinking Cloud, requiring no components. Whenever the croaker ends its turn in the cloud, it gains 5 (1d10) Temporary HP.