Kerojii

The Four Wise Men (4つの賢い人) are four tiny, old, frog-like members of the Red Arrow Pirates who appeared in the sixth One Piece movie. Despite their group's name, they are not all men.

Gallery
The four wise men consists of:

Three of them anger Nami just after being introduced: Keroji believes that they are much wiser then the Straw Hats because of their age. Keroshot calls her immature for getting angry. And Keroko insults her by saying she's only a little younger then herself. The only member that did not take a hostile note to the Straw Hats upon introduction was Kerodeek, who just asked if he could take a nap.

Speedboats
The Four Wise Men used speedboats in the second Test of Hell against the Straw Hat Pirates. Despite the Straw Hats only getting simple speedboats, their boats were outfitted with various weapons and modifications that made them difficult to deal with, but they were ultimately destroyed by Zoro and Sanji.

History
They participated in the second Trial of Hell issued by the Omatsuri against the Straw Hat Pirates. They eventually died when Omatsuri was defeated.