No, this:Creepy Crawlers.
Are you talking about those plastic tabs that would grow into dinosaurs and stuff when you heated them up?
My brother had that thing. You've got to love a toy for little kids that comes with its own hot plate.
There was a mold you poured liquid mess into, then put it into a little oven to cook it into a rubberized insecty thing.
I can still smell those things cooking.