Place milk and pudding in large bowl, whisk for 2 minutes. Let stand for 5 minutes.
Meanwhile cover bottom of 9x13 pan with Graham Crackers, breaking rectangles to cover as much of the pan as possible, forming an even layer.
Stir Whipped Topping in with Pudding, incorporate well. Pour half the mixture and repeat. Top with second layer with Graham Crackers. Refrigerate for 3 hours.
Melt the Chocolate Frosting in microwave enough to pour, about 30 seconds. Mix frosting so that its pourable but not too hot. Pour over, spread and refrigerate until ready to serve. Optional to top with chopped nuts or shaved chocolate.