Quakke is AWESOME!!
I loved the toy design more than the cartoon design... not that they were TOO dissimilar, but I liked Quakke's face more.
Both Quakke and Butthead's toy faces reminded me of characters from the art used in the original Oz books by L. Frank Baum. The art is very early 1900's French/American... and I loved it.
Anyway, Quakke would be an excellent figure... he'd have fit right into the vintage MOTU line anyway... like so many of the NA mutants.