Take a look at this:
That is a fully grown Bull Elephant walking through a river infested with hippos. If I showed you the actual video, you would see that the largest land creature on earth casually walked through that water.
It didn't even try to avoid possibly stepping on one of the hippos. Anything other than an elephant would be trying to run across that river as quickly as possible to prevent itself from being snapped by several jaws, or would decide against crossing it altogether.
So what…that has NOTHING to do with what you asked, right? My point is just to illustrate to you that if this elephant or any other sub-adult or full grown elephant could walk fearlessly through water with the most dangerous creature known to man in all of the Mother Land (Africa) just about everywhere, then what would a crocodile do? What COULD it do?
It doesn't matter how deep the river, lake or swamp is, elephants are too big/tall for the fight to be fixed in favor of the crocodile. The water, at its highest point, would barely come to the elephant’s knees. This “matchup” would be over in under a minute. The crocodile would be trampled to death. Or thrown high into a tree.