Cragadile

A Cragadile is featured in the episode Princess Twilight Sparkle - Part 2. Its name is a portmanteau of "crocodile" and "crag."

When Twilight Sparkle attempts to cross a bubbly creek in the Everfree Forest, she inadvertently awakens a cragadile from its slumber, and in its rage, it attacks her and her friends. Using the black vines that had grown all over the forest, Twilight's friends muzzle and restrain the cragadile before it could hurt Twilight.

As the name suggests, the cragadile's design mostly resembles that of a crocodile, but its hide is covered in rocks.