What if Frank Oz performed occasionally?

[minor muppetz]

Yesterday I started thinking: What if Frank Oz did perform on Fraggle Rock, but in more of a guest performer compacity? Like, if he performed just once, or had a character appearing about as often as Jim Henson had? Who would he have been great as?

I was thinking maybe he could have been The Wizard, or Wander McMooch, or Murray (give him a character interacting with a Jim Henson character).