innocent wompra
I've always assumed that womp rats, being roughly 2 meters long, were intended as a kind of R.O.U.S. (Rodents of Unusual Size) and are presumably equally aggressive and dangerous.
I realize it's a stretch, but it's been stuck in my head canon since I first saw Star Wars.
Crisis on Two Earths has, indeed, been done.
It would have been great to call it "Crisis on a Couple Earth's".