That was a series of cartoon characters: I still have my Tony the Tiger, Yogi Bear, and Huckleberry Hound.
Lucky, lucky you and the other commenter! I wonder if anyone reading this has actually sent in stamps for anything.
Thanks so much for posting this!! I have one of these exact Mickey Mouse spoons. They were "before my time"- I was born in 1962. Like the other poster here, I still have the "Tony the Tiger" spoon from Frosted Flakes, that was from my time!

I have some Disney spoons - Pluto and Minnie. They say "By Bonny" on the back and were made in Japan.