Regarding "progeny" - Google definition:
prog·e·ny
noun
noun:
progeny; plural noun:
progenies
A descendant or the descendants of a person, animal, or plant; offspring. "The progeny of mixed marriages."
As far as a riddle ... perhaps consider one off the "offspring" riddles here:
http://www.riddlesdb.com/riddles/the-offspring-of-a
An example might be:
"What do you call the offspring of a circle and a rectangle?"
(The answer is: an oval)
Hope this helps!
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