ARRANGE: 1/3 of the crackers on the bottom of 13x9-inch baking pan, breaking crackers to fit, if necessary.
POUR: milk into large bowl. Add pudding mixes. Beat with wire whisk 2 minutes. Gently stir in whipped topping. Spread 1/2 of the pudding mixture over crackers. Place 1/2 of the remaining crackers over pudding; top with remaining pudding mixture and crackers.
REMOVE: top and foil from frosting container. Microwave frosting in container on HIGH 1 minute or until pourable. Spread evenly over crackers.
REFRIGERATE: 4 hours or overnight. Cut into squares to serve.