The Environmental Show

The Environmental Show' was mentioned during an Interview with Jim Henson and Frank Oz at the Puppeteers of America Festival in 1989.
The Puppets to the left and right of Jim, The Iguana and Gecko have never been part of any show other than one cameo by both of the charactersin 'Dinosaurs'. Only the Iguana spoke.

Im not sure whether these are Muppets from the planned show, But its the only explanation I could think of. These images came from a TV Guide that had an article on the passing of Jim Henson.