Jimmies is a Northeastern USA usage

Yup...Jimmies were always a fixture of ice-creamery in these parts. Every Carvel, Dairy Queen, and Kohr's Custard stand on the boardwalks have always offered chocolate jimmies, red jimmies (cherry), and even multi-colored jimmies. They usually have bins full of jimmies and just quickly dip the cone into the jimmies to lightly coat the ice cream. You can have jimmies sprinkled on sundaes, too, of course!