Killer Croc even aware that Bruce Wayne is Batman?
 

I dont read much of any old Batman comic with story arcs involving Killer Croc and Im not an expert or anything on if Killer Croc has super sense of smell etc, but has Killer Croc ever been aware that Bruce Wayne and Batman are one and the same?

There's no other evidence that Croc knows Batman's identity, but he's been shown to be smarter than he looks so it's not impossible. I think it would be a fascinating story if Croc ever confronted Batman about his secret or if he decided to keep it to himself for some reason. What do you think?

Isnt croc smart? Or is it king shark? They too many animals as villains)