I actually don't really call them jimmies, either. They're sprinkles or ... what about nonpareils? That's the weirdest name of all, and not just because it violates the "i before e" rule.
There's no accounting for the French. ...
"Nonpareils" is what we always called little round pieces of chocolate, usually dark chocolate, about the size of a U.S. quarter, covered with white jimmies/sprinkles.
Grandma and Grandpa always had a covered glass bowl filled with them on an end table in the living room.