Arrange cake pieces on paper-covered cardboard as shown in photo to assure correct placement. Move all smaller pieces to cookie sheet; return to freezer to keep frozen for easier frosting. Spread cookies'n'creme frosting over larger cake pieces on board to seal in crumbs. Add smaller pieces one by one, spreading chocolate frosting for ears and cookies'n'creme frosting for all remaining pieces, covering all exposed edges to seal in crumbs. Freeze about 15 minutes to set frosting.