Can you find crocodiles in the Tennessee River?

yes i think it was bull sharks that have been found up to 250 miles up freshwater rivers.

Edit;;

There was once a bull shark found 1'750 miles up the Tennessee River. So yes, they can pretty much be found in most freshwater rivers connected to salt water.

Bull Sharks have been found up as far as St. Louis. The Lower Mississippi River to Cairo is about 954 Miles. St. Louis is at least 180 more miles from Cairo, so about 1134 miles to St. Louis. There is not 1,750 miles of the Tennessee River. That answer is wrong. The entire Tennessee is maybe 725 or so, but if a Shark went up the Mississippi and then the Ohio River to the upper reaches of the Tennessee River that may be theoretically possible but highly unlikely as only about 650 miles of the Tennessee River is navigable so without locks no way they could get any further than about Knoxville. The route I just described to Knoxville would be about 1600 to 1650 miles but I have not heard of a Bull Shark higher up than Lake Guntersville which is about 1350 miles or so. I have worked as a Tow Boat Captain on all of the above Rivers. I am not sure but I believe Bull Sharks have been caught higher up the Mississippi River than St. Louis but I did not run higher so I have no personal knowledge of it.