How many movies have Frieda Lipp and Nat Mongioi collaborated on?

They have worked on 2 movies together! Their first movie together was A Special Sesame Street Christmas (1978) while their highest rated movie together was Don't Eat the Pictures: Sesame Street at the Metropolitan Museum of Art (1983). They have not worked together since Don't Eat the Pictures: Sesame Street at the Metropolitan Museum of Art (1983).