Whatever happened to Frankie Frank and Mr. Mustard Head? Mr. Potato Head had a whole bunch of new friends (Picnic Pals) in the ’60s. How could we also forget, Mr. Ketchup Head, Mr. Soda Pop Head, Willy Burger and Frenchy Fry. Mom was quite fascinated by Frankie Frank. Frankie got lost in the house one summer. We never found him.