I was recently reminded of the Weepuls. I was fascinated with these things back around the 3rd grade, so that would be 1982-ish.
Weepuls were a bit of a passing fad. Their feet had a sticker, so for me, back in the day, they were basically the only 3D sticker unless you count puffy stickers. (Scratch-n-sniff stickers were also big back then.)