Homebrew
Hold Breath. The crocodile can hold its breath for 30 minutes.
Multiattack. The crocodile makes two attacks: one with its bite and one with its tail. Bite. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 21 (3d10 + 5) 3d10+5 piercing damage, and the target is grappled (escape DC 16). Until this grapple ends, the target is restrained, and the crocodile can't bite another target. Drag and Drown: in subsequent rounds the croc will attempt to drag grappled prey into the water. Strength Challenge to resist. The croc will drag small prey 20 ft., medium prey 15 ft., and large prey 10 ft. if successful. Tail. Melee Weapon Attack: +8 to hit, reach 10 ft., one target not grappled by the crocodile. Hit: 14 (2d8 + 5) bludgeoning damage. If the target is a creature, it must succeed on a DC 16 Strength saving throw or be knocked prone.