Croconaw are medium-sized, bipedal, crocodilian Pokémon, mostly blue in coloration with yellow accentuations and black eye markings. Croconaw have three clusters of red spikes on their body, one with three prongs on its head like a crest, one with two prongs on its back, and one diamond-shaped spike on its tail. Croconaw has a set of pronounced, yellow-colored jaws. Although Croconaw has been described as always having forty-eight fangs lining its mouth, only six are discernible, with only four visible when the mouth is closed. They possess an asymmetrical, yellow-colored pattern on their chests that somewhat resembles a spotted animal skin.
Along with the usual Water-type abilities, their powerful jaws are capable of regrowing fangs that are lost. Their teeth are positioned like a barbed fishing hook, making them impossible to pull out with ordinary strength.
Croconaw open their huge jaws wide when attacking. Once they bite down, they will not let go until they lose their fangs. New fangs quickly grow into place, and there are always forty-eight fangs lining their mouth.
Croconaw mainly live near water, but are rare in the wild.
Croconaw eats prey, making it a carnivore.
This Pokémon was unavailable prior to Generation I.