Whisk crushed pineapple with packet of instant vanilla pudding.
Fold in half of the whipped topping until incorporated; Once combined, add the remaining half and fold until combined.
Once all the cool whip is folded in, refrigerate until cakes are cooled and ready for frosting.
After your cake is cooled, frost the top of the first layer and the second cake and frost the remaining cake heavily.
You can leave it just like that or you can top it with strawberries, pineapple, mandarin oranges and so on.