I think I remember hearing that Underdog and Count Chocula had runs of 1,000 pieces. I don't know much about the largest Freddy which I think is 40 inches tall (I heard it's pretty top heavy. The 20 inch Freddy i've seen different measurements listed for it on ebay. I've seen 20",18" and 17" associated with it.
I came across an auction for the red Freaky Tiki on Ebay recently and it said 96 of them were made. I didn't snag it though. I was to busy bidding on a Giant Glow Count Chocula that reads Make A Wish along the bottom

Has there been a list created about this in the past on this site?