It was named Hodag and was said to have:

“the head of a frog, the grinning face of a giant elephant, thick short legs set off by huge claws, the back of a dinosaur, and a long tail with spears at the end”

It even has its own wiki page. Of course it was all part of the legend that is the Hodag. What random animals can you think of? Maybe you could try making one up?