Merrow

Amphibious. The merrow can breathe air and water.

Claws. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) piercing damage and the target is grappled (escape DC 14). Until this grapple ends the merrow can't attack a different creature with its claws.

Harpoon. Melee or Ranged Weapon Attack: +6 to hit, reach 10 ft. or range 20/60 ft., one target. Hit: 11 (2d6 + 4) piercing damage. The target makes a DC 14 Strength saving throw. On a failure the merrow pulls the target up to 20 feet toward the merrow.

Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 6 (1d4 + 4) piercing damage, or 9 (2d4 + 4) piercing damage if the target is grappled.