A popular potato joke is:
Q: What do you call baby potatoes?
A: Tater tots.
The joke has been cited in print since at least 1995.
“What do you call baby potatoes?"/"Small fry” is a similar joke with a different punchline.
Wikipedia: Tater tots
Tater tots are a side dish made from deep-fried, grated potatoes. They are widely recognized by their crispness and cylindrical shape. “Tater Tots” is a registered trademark of Ore-Ida (a division of the H. J. Heinz Company) that is often used as a generic term.
23 May 1995, Wisconsin State Journal (Madison, WI), “Laugh Track,” pg. 2C, col. 4:
From Nathan, Madison:
Q. What do you call a baby potato?
A. A tater tot.
Google Groups: alt.weemba
> rotten jokes from 1998:
> What do you call a child couch potato?
> >a tater tot
18 April 2002, Los Angeles (CA) Times, “The Kids’ Reading Room; Reading by 9; Jokes & Riddles,” pg. E8:
What are baby potatoes called? Tater-tots. (Kristina, Moorpark)
Google Groups: alt.religion.rabbet
Humor from the Net
What are baby potatoes called?
What do you call a baby potato....A tater tot!
5:40 AM - 5 Jan 2011
George The Giant
Stupid joke of the day: What do you call baby potatoes?
10:03 AM - 23 Feb 2016