Chameleosaur

Adaptability. Whenever the chameleosur takes damage, it becomes resistant to that damage type until hit with another damage type.

Camouflage. The chameleosaur can spend an action on its turn to become invisible. This invisibility wears off whenever the chameleosaur moves or attacks.

Multiattack. The chameleosaur makes two claw attacks.

Claw. Melee Weapon Attack: +7 to hit, reach 5ft., one target. Hit: 14 (3d6 + 4) slashing damage. 

Grappling Tongue. Ranged Weapon Attack: +4 to hit, reach 30ft., one target. Hit: 3 (1d4+1) bludgeoning damage. A medium or smaller target hit by this attack must succeed a DC 17 Strength saving throw or become grappled.

Bite. Melee Weapon Attack: +7 to hit, reach 5ft., one target. Hit: 13 (2d8 + 4) piercing damage. 

Chew. The chameleosaur makes two bite attacks against a target restrained by Reel. If Chew reduces a target to 0 hit points, the chameleosaur swallows it, and the target takes 21 (6d6) damage at the start of each of its turns.

 Reel. The chameleosaur pulls a creature grappled by its tongue up to 30 feet straight towards it. It may then make a bite attack. If the bite attack hits, the target must succeed a DC 20 Strength save or become restrained.