The Bloody Crocoraptor is a dragon that is mentioned twice in How to Be a Pirate.
On a quest to the Isle of the Skullions, Wartihog and Clueless discussed:
- "Who would win if a Skullion was to fight a Bloody Crocoraptor in one-to-one combat?"
Clueless thought the Crocoraptor had no chance.
Later, after Hiccup discovers a Skullion footprint that is much larger than expected, Fishlegs comments:
- "No question that it'd beat the Bloody Crocoraptor in one-to-one combat, then."
There is no description as to what a Bloody Crocoraptor looks like, though it might be inferred it looks at least somewhat crocodilian.