Mr. Zerk is Mother's Bouncer/ Henchman that works at Dreamland. He is a dream character, with no real life counterpart. He is a mute apart from grunts, and seems to be styled after a human Chewbacca or Lurch from The Addams Family.
Season 8
Mr. Zerk is Mother's Bouncer/ Henchman that works at Dreamland.
Trivia
Level 3 of the mobile game is named for him, "Zerk Chicken".