A crocodile can't stick out its tongue. (Source)
The crocodile's tongue is attached to the bottom of its mouth by a membrane. A crocodile may not be able to stick out its tongue at you, but it isn't entirely useless. The crocodile's tongue has salt glands, which means that a crocodile's tongue performs the same function for a crocodile that kidneys perform for us: excreting salt. Crocodiles have less efficient kidneys and have thick, salt-resistant skin, which means that they have a hard time releasing salt through their skin. They have to use their tongue to get rid of salt and keep from getting dehydrated.