I saw a recipe for a no-bake pumpkin pie in a magazine last fall that called for instant pudding mix and a can of vanilla frosting in it. I'd love to try the recipe if anyone can help me find it!
Are you sure it wasn't Cool Whip instead of the frosting?
This doesn't have the pudding in it but does have the frosting. Hope someone can come up with the exact recipe you wanted but check this out.
Here is a link that might be useful: Frost on the Pumpkin Pie