After years of waiting and concentrating on manifesting it, I finally spotted an old Madball among a big bin of musty toys. It is Screaming Meemie, from the original Series One Toys by AmToy from 1985. This is in excellent condition considering it is 23 years old and made of foam rubber.
Madballs went through two series of 8 balls each, plus a series of 4 larger sports balls (called Super Madballs). They later spawned a comic book, a few cartoon episodes, and other toy products. The New York hardcore band, Madball, was, in fact, named after Madballs toys. A redesigned series of Madballs updates have recently been available in toy stores.
Madballs cartoon: Escape from Orb (part 1)