I found this on the net and then altered to suit my love for pineapple!!

Frozen Pineapple Pie (original recipe)
2 graham cracker pie shells
16 oz. cool whip, thawed
20 oz. can crushed pineapple
1 (14 oz. can) condensed sweetened milk

Mix milk and cool whip til blended well, add pineapple, pour into pie shell.
Freeze. Remove from freezer about 30 minutes ahead of time to make slicing
easier.

My altered recipe: Frozen Pineapple Pie
2 Keebler Shortbread pie crusts
16 oz. cool whip, thawed
2 (20 oz. cans) crushed pineapple
1 (14 oz.can) condensed sweetened milk

Mix milk, and cool whip til blended well, add pineapple, pour into pie shell.
Freeze. Remove from freezer about 30 minutes ahead of time to make slicing
easier. Yummy!!