Werecrocodile

Shapechanger. The werecrocodile can use its action to polymorph into a crocodile-humanoid hybrid or into a Large Crocodile, or back into its true form, which is humanoid. Its statistics, other than its size and AC, are the same in each form. Any equipment it is wearing or carrying isn't transformed. It reverts to its true form if it dies.

Hold Breath. The Werecrocodile can hold its breath for 15 minutes in crocodile or hybrid form

Multiattack. In crocodile form, the werecrocodile makes two bite attacks. In humanoid form, it makes two greatclub attacks. In hybrid form, it can attack like a crocodile or a humanoid.

Bite (Crocodile or Hybrid Form Only). Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 15 (2d8 + 4) piercing damage, and the target is grappled (escape DC 12) . until this grapple ends, the target is restrained, and the Werecrocodile can't bite an other target. If the target is a humanoid, it must succeed on a DC 14 Constitution saving throw or be cursed with werecrocodile lycanthropy.

Greatclub (Humanoid or Hybrid Form Only). Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 10 (1d8 + 4) bludgeoning damage.