Could this be true?

The alligator and crocodile are basically dinosaurs themselves, they are almost unchanged since the cretaceous period.

Dinosaurs aren't reptiles, they weren't cold blooded.

Just because something is unchanged from the cretaceous doesn't make it a dinosaur. mosquitoes and molecanths aren't dinosaurs.

Also, reptiles, besides snakes, and a few legless lizards, have legs that protrude outward and then bend at the elbow, knee downwards. Dinosaurs, ALL dinosaurs, have legs that are positioned directly under them and do not flail out.,

You don't have to be cold-blooded to be a reptile. Since Great White Sharks and Mako sharks are warm-blooded, are they not fish?

There are zero warm-blooded reptiles. The moment a mammal-like reptile became warm-blooded, it ceased being a reptile and became a mammal, that's literally how that branch off is classified in taxonomy. The exact same thing happened with dinosaurs. They are NOT reptiles.

Tegus are a lizard that is warm-blooded. Warm-bloodedness and cold-bloodedness is not a sign of a species' classification, just an aspect of it

Mesotherm is the term for Tegus, Great white, Tuna, Mako and most Dino's. They were not warm blooded - nor cold blooded (Endothermic or ecothermic). http://dx.doi.org/10.1126/science.1253143

I knew the Tegus was a'comin'. A Tegus can only do it while pregnant, it's not warm-blooded; still doesn't count.