Its license plate says "Famous Potatoes"

I believe the answer is:

idaho

(Other definitions for idaho that I've seen before include "One of 22 Across, capital Boise" , "The Gem State, known for its potatoes" , "somewhere in the US" , "Rocky Mountain state" , "State of north-west USA" .)

I've seen this clue in The New York Times.

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