In a large bowl, beat the instant pudding mix with 2 cups of cold milk for 1 minute. Use only 2 cups of milk total, not the amount on the box.
Gently fold the thawed Cool Whip into the pudding until smooth and no streaks remain.
Line the bottom of a 9x13 pan with a single layer of whole graham crackers. No need to grease the pan. Broken crackers are fine; just don't crush them.
Spread half of the pudding mixture evenly over the crackers.
Add a second layer of graham crackers, then spread the remaining pudding mixture over the top.
Finish with a third layer of graham crackers.
Spread the chocolate fudge frosting evenly over the top layer of graham crackers.
Cover and refrigerate for at least 12 hours, or a full day if you can, until the crackers are soft.
Cut into squares and serve cold.