Heat oven to 350°F. In large bowl, knead cookie dough and flour with hands until well mixed.
On floured surface, roll dough to 1/4-inch thickness. Cut with floured 3-inch crescent moon-shaped or round cookie cutter. On ungreased cookie sheet, place cutouts 1 inch apart. Reroll dough and cut additional cookies.
Bake 10 to 12 minutes or until edges are lightly browned. Cool 5 minutes; remove from cookie sheet to cooling rack. Cool completely, about 20 minutes.
Tint frosting with yellow food color. Frost cookies. Sprinkle with yellow sugar. Let stand until set.