I went to yahoo.com, then clicked on images and wrote "ferret stamps"
It gave 8 listings.  Some had nothing to do with ferrets but there was
a hedgehogstamp.com (i think that was the name) and it had a ferret
caroling stamp and a single ferret rubber stamp.  Interestingly, there
was a ferret postage stamp-I want that!
[Posted in FML issue 4427]