Something like a leech, something like a walrus, something like a pig. Definitely like a tardigrade, maybe a bit like a game enemy. This is a variant of my tardigrade / waterbear monster: https://lb3d.co/2021/02/04/waterbear-tardigrade-moss-piglet-3d-model-game-asset/.
When I design monsters, I enjoy incorporating the circular tooth arrangement similar to leeches.
This guy can easily be pictured rising to the surface of the water like a hippo, making a sound that a giant leech would make, if he were, perhaps, half walrus.
Right now I have alot of work to do with these variants, rigging them and porting them to Unity 3d and other stores.
Waterbear / Leech Giant Monster, Basic
Waterbear / Leech Giant Monster, Lichen / Algae Coated
Keep checking back for more!