Preheat the oven to 350 F. Place melted butter in a shallow dish, In another shallow dish, combine granulated sugar and ground cinnamon. Unroll crescent rolls, and separate into crescents.
Roll each marshmallow into the melted butter, then roll into the cinnamon sugar mixture. Place each marshmallow onto each crescent roll.
Roll up into ball, covering the marshmallow completely. Place onto a large greased baking sheet. Bake for 12-15 minutes.