No modern crocodile would be able to beat an adult Tyrannosaurus rex in a battle, but it could escape to the water. A large crocodile, however, could kill a very young Tyrannosaurus.
Some prehistoric crocodile species, such as Deinosuchus or Sarchosuchus, were far larger than any modern species, growing up to 40 feet long. These didn't live at the same time as Tyrannosaurus, but if an adult of one of these species came across a T-rex, they would have been relatively evenly matched at first. However, if the T-rex survived long enough, the crocodile would have run out of energy and been forced to retreat to the water. There is some fossil evidence that T-rex may have lived in packs, and if this is the case, a pack of T-rex would have had a huge advantage over any Deinosuchus attack.
a nile croc by height
nile croc
As much as I hate to say it, Killer Croc would win. Bane can easily be defeated once he's cut off from the venom steroid that makes him big.
An animal face off video has been seen and croc wins.
T rex
I'd bet on Bowser.
It depends what type of alligator/crocodile you are talking about, but usually a croc would win. It has the advantage of size.
t-rex would win because its much stronger and has the most powerful jaw
who will win a hippo or a croc
In water: likely the croc. On land, it would probably be a stand-off.
Tyrannosaurus Rex would win because even if Tyrannotitan was bigger, T.rex had better vison, was faster, and maybe a better bite force.
Ben 10 would win because generater rex can use different kind of machines but ben 10 can turn into different aliens.