Idahoan, say

TATER STATER

["Think of a nickname for someone from the Gem State, especially one that plays on its famous crop."]

"Idahoan, say" hints at someone from Idaho, a state famous for potatoes—hence the slang term "tater" for a potato. "Stater" is a playful way to say "someone from a state," like "New Yorker" or "Texan." Put them together, and you get "TATER STATER," a lighthearted nickname for an Idaho resident.