Krakkonor (5e Creature)
From D&D Wiki
Large monstrosity, any neutral alignment
Amphibious. The krakkonor can breathe air and water.
Multiattack. The krakkonor makes two bite attacks.
Krakkonor are large predators that prowl coastal regions, hunting for fish, birds, and other sea creatures, though not straying away from anything it can eat on the shore either. They can sometimes be persuaded by goblinoids, orcs and giants to live near their settlements and act as guards or hunting companions, though a krakkonor will swiftly abandon or devour any master that it feels to be mistreated by. They tend to hunt in pairs or small packs of up to ten individuals, coordinating to take down even the largest prey.