Bite. Melee Weapon Attack:  +3 to hit, reach 5 ft., one target. Hit:  6 (1d6 + 2) piercing and 3 (1d4) poison damage, and the target must make a constitution saving throw (DC 12) or be poisoned until the end of its turn.

Tail Bash. Melee Weapon Attack:  +3 to hit, reach 10 ft., one/multiple target(s). Hit:  10 (2d6 + 2) bludgeoning damage, and the target must make a strength saving throw (DC 14) or be pushed 10ft. backwards and knocked prone.

Evolve. Once per round, the Adaptive Snapjaw can mutate based on what type of damage it takes. As a reaction it gains resistance to the type of damage it will take until the end of an opponents turn. It can only do this, if it was hit by the same type of damage before. It cannot gain resistance to magical damage.