Boop Hydra

Multiple Heads. While it has more than 1 head, the boop hydra has advantage on saving throws against being blinded, charmed, deafened, frightened, stunned, and knocked unconscious.

At the end of its turn, it grows two heads for each of its heads that died last turn, unless it has taken fire damage since its last turn. The boop hydra regains 1 hit point for each head regrown this way.

Wakeful. While the boop hydra sleeps, at least one of its heads is awake.

Multiattack. The boop hydra makes as many bite attacks as it has heads.

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: (1d + 1) [piercing] damage. 

Boop the Snoot. When cornered the boop hydra will attempt to look defenseless and adorable. Every humanoid within 10 feet of the boop hydra that can see it must succeed on a DC 11 Charisma saving throw or be charmed until they boop the snoot. Once the snoot has been booped the effect ends. The boop hydra must take a bonus action on its subsequent turns to continue it's cuteness. It can end the effect any time. The effect ends if the boop hydra is incapacitated.