Pimon is voiced by Billy West and Tumbaa is voiced by Kevin Michael Richardson.
They steal bugs from Timon and Pumbaa and say that their philosophy is Kahuna Potato (which means they'll never leave Timon and Pumbaa alone), before giving the duo wedgies.
Later in the episode, after getting trained by Rafiki, Timon and Pumbaa confront Pimon and Tumbaa while they are picking on a squirrel. During the fight, Pimon and Tumbaa trick the duo into thinking they are hurt, before giving them wedgies again.
Rafiki arrives and encourages Timon and Pumbaa to use Hakuna Matata to win the fight. The duo use their own skills to finally defeat Pimon and Tumbaa, before later forcing them to feed them bugs as punishment.