Crocodile do have tongues which are held in place by a membrane. This membrane limits the amount of movement which makes it impossible for a crocodile to stick lout his/her tongue. Check out http://en.wikipedia.org/wiki/Crocodile for more details.
i agree with Clemence. tongues DO have tongues. you cannot really see the croc's tongue as it is almost impossible for the croc to stick out its tongue. TIP: stick out your tongue at him and he will not be able to do that back... hahaha