Boop

Skin of Squish. If an attack is use on the boop the damage goes back into the attacker with and additional 1d20 bludgeoning damage.

Spellcasting. The boop a 1-level spellcaster. Its spellcasting ability is Charisma (spell save DC 12, +5 to hit with spell attacks). The boop has following bard spells prepared:
Cantrips (at will): 
1st level (2 slots): Charm person 

Swell. The boop starts to swell up to its size = huge. All characters within 30ft. of the boop must make a dexterity saving throw or take 1d12 damage and fall prone, on a failed save the character only takes have the damage and dose not fall prone.

Bump. Melee Weapon Attack: +2 to hit, reach 5 ft., 1 target. Hit: 8 (2d6 + 2) bludgeoning damage. 

Fart (Create stink cloud). RangedWeapon Attack: +1 to hit, range 5/40 ft., 10 targets. Hit: 13 (1d20 + 3) poison damage. The poison lasts for 5 turns.

Swallow. If an object is moving more that 50ft. towards the boop the boop can quickly swallow it whole when it comes within reach. (5ft.)