Over low heat, melt butter in a small saucepan. Add the marshmallows. Stir until melted.
Into a bowl, put the rice krispie cereal. Next, pour the melted marshmallow mixture over the cereal. Stir to combine. Then with buttered hands (or I use plastic gloves) form the cereal mixture into 1.5 inch balls. You should have 14 total.
Gently twist apart the oreos. On one half of the cookie spread a small amount of frosting on the inside. Then place a rice krispie ball on top of the frosting and gently press down.
Onto the second half of the oreo, spread another small amount of frosting on the inside. Place three candy corn pieces across the top in a fan pattern. Press the second half onto the "back" side of the rice krispie ball.
Attach another candy corn piece with a small amount of frosting to form the turkey's head on the "front" side of the rice krispie ball.
These are best when made the same day you plan to serve them. The frosting sometimes makes the Oreo cookie a little soft.