Crocodile

The crocodile is Captain Hook's great nemesis. She swallowed his hand after Peter Pan chopped it off, and liked the taste of it so much that she now follows Hook around, hoping to eat the rest of him. The croc also swallowed a clock, thus giving off a tell-tale ticking sound as she approaches. She is often erroneously thought to be a male, but Barrie states female. In comics published later on, her character was known as Tick-Tock the Croc. In the books Peter and the Starcatchers the crocodile was called Mr. Grin by the redskins.

Movie
In the film Hook, Captain Hook has killed the crocodile and made it into the foundation for a clock tower. But he is still gripped with fear when he hears a clock ticking, and keeps a collection of clocks he has broken. In his duel with Peter, Hook is held at bay by a circle of Lost Boys holding clocks, and is apparently "eaten" by the crocodile, which seems to temporarily come back to life and engulf him.

In the 2003 film, the croc is a giant reptile, maybe Deinosuchus. John and Michael meet the croc in a cave of the jungle and after waking the sleeping reptile, they are nearly eaten. The croc comes in to the Black Castle and attacks Hook just as he wants to kill the injured Peter. At the end the croc appears under the flying, tortured Captain, who has too many bad thoughts about flying and thus falls into the mouth as the longed-for treat.

In the 2011 SyFy Channel's version Neverland, There are many crocodiles, all much bigger than any normal crocodile, with four pairs of legs. The Kaw indian tribe hunts the crocodiles and serves their meat to the Lost Boys when they stay with them. One specific crocodile eats Hook's hand and his pocket watch, but there is never a clear distinction if this crocodile is special or different from the rest.

Disney
Commonly referred to as Tic Toc, the Disney version of the crocodile is less frightening than most. It is male unlike the original book, and often acts very personified. He appears to have a relationship with Peter, seeing as they hold a short conversation when Peter is fighting Hook in Skull Rock. Tic Toc also appears to be at least somewhat "polite" in that he respects Mr. Smee when he tells him to shoo. In fact, in the sequel Return To Never Land (In which the crocodile was replaced by a giant octopus) Mr. Smee comments that "at least the crocodile had manners" when the octopus squirts him with water as Mr. Smee tries to shoo it away. This Crocodile does appear to have only eyes and stomach for Captain Hook, as he never attacks anything or anyone else that enters the water.

Peter Pan and the Pirates
In the 1990 television series Peter Pan and the Pirates, Hook has great respect for his enemy, hating her more than fearing her. In the episode "Wendy & the Croc" he plans to kill the crocodile, but Wendy has been swallowed by it and the Lost Boys stop him to kill the reptile to save Wendy. This version of the crocodile does is just as eager to eat the Lost Boys as to eat Hook.

Peter Pan in Scarlet
In Peter Pan in Scarlet, Hook survived in the belly of the crocodile. When the muscle contractions meant to crush and digest him broke the vial of poison he kept with him at all times, that killed the crocodile, and Hook used his hook to claw out.