Ninki Nanka
The Ninki Nanka is a creature comes from the fresh water bodies in West Africa. It is described as having a body like a crocodile, a head like a horse with three horns, and a long neck. It is a nocturnal creature that lives in mangroves, and has a ravenous appetite. Some local legends state that it can transform into a thirty foot long giant snake.
Citations:
Bane, Theresa. Encyclopedia of Beasts and Monsters in Myth, Legend and Folklore. United States, McFarland, Incorporated, Publishers, 2016.