The Infinite Spawn, Chibichi (5e Creature)
From D&D Wiki
Tiny aberration, chaotic neutral
Damage Vulnerabilities all damage
perpetual nuisance. When a chibichi dies, 1d3-1 chibichis appear in an unoccupied space close to the thing that harmed it. if it was a creature, the summoned chibichis are hostile toward it. cute...wait, no, its ABOVE cute. Any creature that can see the chibichi must make a DC 20 constitution check, or be charmed by the chibichi. the creature must make its way toward the creature and try to snuggle it: eg grapple it.
Nibble. Melee Weapon Attack: always hits, reach 5 ft., one creature. Hit: lowers the hit point maximum by 1 (1d3 - 1). After 1 (1d3-1) minutes, if the target is not healed or dead, it adds 1 (1d4 - 1) to its hit point maximum per times it was nibbled since its last heal, and is healed. the number it regains is the number of chibichis that appear, non hostile, in the nearest unoccupied space next to the target. if the target's hit point maximum lowers to 0, it dies/is destroyed.