Amphibious. The giant crayfish can breathe air and water.
Multiattack. The giant crayfish makes two claw attacks.
Claw. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit:7 (1d10 + 2) bludgeoning damage, and the target is grappled (escape DC 12). The crayfish has two claws, each of which can grapple only one target.