Somehow growing up my mother found a few old Mr. Potatohead sets, some just in cardboard boxes, and one in a plastic potato. It made sense from a cleanup perspective, plus no starchy juices running into the shag carpet.
What doesn’t make sense is the thick, dull pegs now used. The do not easily enter a potato or stay there. My kids have a modern one and it is much less fun. Also now the variety of things to plug into the plastic body is so small. One would have to get more than one set to have meaningful varity.