No suspense here. “tater” is a more fun, and quintessentially American, way of referring to a potato than just saying “potato.” And “tot” conveys that what we have here is a rootin’-tootin’ little offspring of a tater. “Gem” gets at the same thing, I suppose, but less obviously. Plus, since we’re talking about a fried-food, any name that sounds like it should be said with a drawl gets a bonus point.
Jeremy’s winner: tater tot