I looked up the meaning of crocodile in the dream dictionary, here is what it says:

The meaning here depends on the action. If you merely observed him, he’s a warning against untrustworthy associates who are trying to influence you adversely. Stand firm. If he chased or threatened you, good luck is sure to follow, unless he caught or injured you, in which case you are in for a painful disappointment or business reverse; however, if you killed a crocodile or saw a dead one, you will have suecess beyond your wildest expectations.