The mashed potatoes were so potatoey that they melted in my mouth.

The texture of the cake was potatolike, dense and starchy.

Potator is an obsolete noun that refers to a person who drinks alcohol excessively.

I bought some potators from the grocery store.

The potatoheads are a popular toy among children.

Potatohead is a popular toy among children.

He is feeling couch-potatoey today.

Potatophiles are people who love potatoes.

She is a true potatophile, she can eat potatoes in any form.