Grappler. The caulamong has advantage on all attacks it makes against an enemy it has grappled.

Innate Spellcasting. The caulamong's spellcasting ability is Wisdom (spell save DC 11, +3 to hit with spell attacks). The caulamong can innately cast the following spells, without any material components:
Cantrips (at will): Vicious Mockery
1st level (1/day): False Life, Jump (self only)

Reckless. At the start of its turn, the caulamong can gain advantage on all melee weapon attack rolls it makes during that turn, but attack rolls against it have advantage until the start of its next turn.

Multiattack. The caulamong makes four attacks: one with its club, one with its bite, and two with its fists.

Club. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 2) bludgeoning damage. 

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 2) piercing damage.

Fist. Melee Attack Weapon: +4 to hit, reach 5 ft., one target. Hit: 4 (1d4+2) bludgeoning damage.