Push some frosting in all the holes and then add a thin layer on top of the cookies. Using a spatula, spread the frosting so the cookies are completely covered.
Add another layer of cookies and fill in any holes.
Add another layer of frosting on top of the cookies and spread out with a spatula.
Repeat for the next two layers.The top should be covered with frosting.
Place some plastic wrap on the top of the loaf pan and place in the freezer for 2-3 hours.
Remove from the freezer and unwrap the top of the cake.
Flip onto a serving plate to have the cookie side facing up. If you want the frosting side to be facing up, flip it with a spatula and smooth out any frosting that was disturbed.