Hip Hopper
A one-legged creature and champion wrestler of the Hopper people.
First named in The Patchwork Girl of Oz, ch. 21
I'm Hip Hopper--Hip Hopper, the Champion.
As the books describe them
He had but one leg, set just below the middle of his round, fat body; but it was a stout leg and had a broad, flat foot at the bottom of it, on which the man seemed to stand very well. The Patchwork Girl of Oz, ch. 21