This animal appears in the Monster Manual (2024).
Amphibious. The crab can breathe air and water.
Claw. Melee Attack Roll: +3, reach 5 ft. Hit: 4 (1d6 + 1) Bludgeoning damage. If the target is a Medium or smaller creature, it has the Grappled condition (escape DC 11) from one of two claws.