From the Super Mario Wiki
“Da boss told me to look after dis place. You do anythin' funny, I'll toss you like DAT!”
Rocko is a member of the Pianta Syndicate and a lackey of Don Pianta who appears in the game Paper Mario: The Thousand-Year Door. Goombella refers to him as "the low man on the totem pole", as he was just employed and initiated. Rocko works as a bouncer and keeps the Pianta Parlor running smoothly. He doesn't have any significant effect on the plot of Paper Mario: The Thousand-Year Door. Rocko looks a lot like Vinny and Tony.