Prepare two cakes in bundt pans and cool completely.
Color most of the frosting a deep orange color, reserving about 1/2 cup and color it black. (Dark chocolate fudge frosting can also be used.)
Place one bundt cake upside down (rounded side on the bottom) on a cake plate; frost the top only. Place the second bundt cake flat-side down on top of first cake. Frost the entire cake with orange frosting, making up and down motions with spatula to simulate a pumpkin.
Insert the Ho-Ho in the middle of the top of the bundt cake to make the stem. Using black frosting to make eyes, nose, mouth, etc. (Or, use candies, gum drops, black licorice, and jelly beans to decorate.)