Automated Muppets were animations versions of the Sesame Street characters that appeared at the park in 1982.
Images from YouTube
The automated Oscar the Grouch was setup in a small outdoor stand. He would pop out of his can and talk to the kids around him (via a recording of Carol Spinney as Oscar.)
Oscar and Cookie Monster were both mentioned in a 1982 news article. I don't know when (or why) these characters were phased out.