 Kenny provides the voices of SpongeBob SquarePants , his pet snail Gary , the French Narrator , Harold SquarePants , Patchy the Pirate , and the Dirty Bubble . Kenny previously worked with Hillenburg on Rocko 's Modern Life and , when Hillenburg created SpongeBob SquarePants , he approached Kenny to voice the character . The voice of SpongeBob was originally used by Kenny for a minor background character in Rocko 's Modern Life . Kenny says that SpongeBob 's high @-@ pitched laugh was specifically created to be unique . They wanted an annoying laugh in the tradition of Popeye and Woody Woodpecker . 
