Yokozuna

First Appearance: Chapter 322; Episode 228

Yokozuna is a giant sumo-wrestling frog, who was a friend (as well as pet) to the legendary shipwright Tom until Tom's execution. He cares very much for his friends and loved ones. He is exceptionally loyal to Franky who taught him the frontcrawl-stroke when they were younger.

(Source: One Piece Wikia)