A Komodo dragon for comparison

A swamp hopper was a moderate-sized Safeholdian amphibian, with a around fifty to sixty-five pounds.

It was carnivorous, subsisting primarily on fish and other small game, and looked rather like a six-legged Komodo dragon, but had a fan-like crest which it extended and expanded in response to a threat or in defense of territory. It was also equipped with air sacs on either side of its throat which swelled and expanded under those circumstances. It was ill-tempered, territorial, and aggressive. (LAMA)