Croconaw is a bipedal, crocodilian Pokémon. It has well-developed, rounded jaws with two fangs visible in the corners of the lower jaw even when closed. Its eyes are red with black markings around them. There are three clusters of red spikes on its body: one with three points on top of its head, one with two points between its shoulders, and a diamond-shaped one near the tip of its tail. While most of its body is blue, its lower jaw is yellow and there is an asymmetrical, yellow-and-blue pattern around its chest that resembles a spotted animal skin.
Although Croconaw is described as always having forty-eight fangs lining its mouth, only six are discernible. The tips of its teeth are slanted backward similar to a barbed fish hook; this makes them impossible to remove once embedded in something. If it loses any teeth, they will quickly grow back. Croconaw can rarely be found near water.
Croconaw made its TV debut in The Legend of Thunder!, under the ownership of Marina and the nickname of Wani-Wani. She obtained it as a Totodile from Professor Elm. In A Stand-Up Sit-Down!, it was revealed to have evolved into a Feraligatr.
In Bagged Then Tagged!, Khoury's Totodile evolved during a Tag Battle against Ash's Monferno and Dawn's Cyndaquil, where it was partnered with Lyra's Chikorita. Despite the evolution, they were defeated.
Croconaw made its main series debut in Mother of All Battles, under the ownership of Ranger Mason, who uses it to help protect her reserve. It also battled the Pokémon Poacher Brothers when they targeted a Larvitar and its mother Tyranitar.
In The Champ Twins!, Bryan used a Croconaw in a battle against Ash and Dawn alongside his twin brother Ryan and his Quilava. The twins were initially able to defeat Ash's Turtwig and Dawn's Piplup due to the latter two having a lack of teamwork, but they were defeated in the rematch.
In The Pirates of Decolore!, a Croconaw abandoned by its Trainer had become the leader of a group of pirate Pokémon, which consisted of an Azumarill, Octillery, and Ducklett. After losing in a Double Battle between Ash, Snivy, and Pignite, Croconaw, and the other pirates stopped stealing and joined Officer Jenny's coast guard after apologizing to everybody they stole from.
Croconaw debuted in Celebi: The Voice of the Forest, under the ownership of Dundee. He used it to battle Ash's Pikachu, but they lost to Pikachu's Thunder Shock.
A Croconaw appeared in the opening sequence of Destiny Deoxys.
In The Rise of Darkrai, Darkrai hit a Croconaw with a Dark Void.
A Croconaw appeared in Camping It Up!.
A Croconaw appeared in Ghoul Daze!.
In The Power of Us, a Trainer's Croconaw competed in the Pokémon Catch Race. A second Trainer's Croconaw was seen in a flashback.
||Croconaw, the Big Jaw Pokémon, and the evolved form of Totodile. It opens its mouth wide and attacks, and if it loses its teeth, they regrow quickly.
||Croconaw, the Big Jaw Pokémon, and the evolved form of Totodile. Once it bites down on something, it won't let go until it loses its fangs. But new fangs grow back quickly.
||The moves Croconaw is able to use are: Bite, Aqua Tail, Superpower, and Hydro Pump.