Potcha

and his partner Mondai were two imposters who tried infiltrating Konoha.

Guy and Lee Impersonator Arc
Potcha and Mondai went to infiltrate Konoha and gather its secrets by disguising themselves as Rock Lee and Might Guy respectively, while the real Guy and Lee are out on a mission. They are oblivious to the fact that their disguises are fooling nobody, except for Naruto. Tsunade, Sakura, and Tenten force them along by giving them outrageous missions, preventing them from learning anything. They are defeated when the real Guy and Lee attack them with their Double Dynamic Entry technique.

Trivia

 * In the episode Poccha calls himself while disguised as Rock Lee, which is a pun for  which means "chubby".