Feraligatr did not originate from fanon, and the information on this page may not be entirely accurate to their canon. You may read more about this subject in the context of their canon on the following wiki(s):
Feraligatr (Japanese: オーダイル Ordile) is a Water-type Pokémon.
It evolves from Croconaw starting at level 30. It is the final form of Totodile.
Feraligatr is a bulky, bipedal crocodilian Pokémon that is primarily blue with accents of red and yellow. A notable feature of Feraligatr is its large, powerful, jaws that are able to bite and lock down on opponents. Three pointed teeth are visible when Feraligatr closes its mouth, two from the lower jaw and one from the upper. Feraligatr intimidates its foes by opening its huge mouth. Feraligatr has three sets of spikes on its body. The one on its back appears particularly prominent, due to its size and the bulk of Feraligatr’s shoulders. It has a bisected, V-shaped yellow pattern between its thighs. Feraligatr also has large scales on its arms, tail, and legs. When hunting or fighting, Feraligatr is agile and fast, due to its powerful hind legs that are used to kick the ground hard and charge. Feraligatr can rarely found living near water with the rest of its evolution family.