I know.... But it wasn't Disney...
Hello,
I don't think that Disney ever did that... (they've awlays stuck with the coin pressing machine.... which they really tried to promote with their 25 year special edition anniversary collection.)
The plastic animal molds are at Gatorland Zoo. (Could it be that you remember it from there?) As far as I know, Gatorland zoo had a whole collection of those plastic animal molding machines, the ones that stick out in my memory are the Gorilla and the Dolphin.... But I don't recall it being at the Walt Disney World Parks.... Sorry.