Freeze cookie dough at least one hour before using. Heat oven to 350~. cut frozen dough into 1/4" slices. (Return dough to freezer if it becomes to soft to cut.) Place slices 3: apart on ungreased cookie sheets. Bake for 8-12 minutes or until golden brown. Cool 2 minutes; remove from cookie sheets. Cool completely. Meanwhile, in small bowl, combine powdered sugar and margarine, adding enough milk for desired consistency. Beat until smooth. Put half of frosting in a small bowl. Add red food color; stir until blended. Frost cookies with red frosting on upper half of cookie. Leaving middle for Santa's face, frost lower half with white frosting. Use small amount of frosting to attach chocolate chips for eyes and red cinnamon candies for nose. Lightly press coconut into white frosting for beards. Lightly press marshmallow into red frosting for pompom on hat. Allow frosting to set. Store between sheets of waxed paper in tightly covered container.