A Shock Rocker is an Intern armed with the Shock Rocker Club. They were originally meant to be security personnel and bodyguards defending an important Vykkers Labs location with an electrically-charged club.
Unfortunately, due to time constraints during the production of Oddworld: Munch's Oddysee, both the Shock Rocker and their weapon did not make into the final game.
They would have originally filled a role similar to the Slig Bouncer and Vykker Sawbones. While the Shock Rocker was not finalized, a Slig variant known as the Shock Rocker Slig made it in Oddworld: Soulstorm.