For filling: Melt marshmallows in milk. Let cool. Fold in cool whip. Spread over cooled crust. Chill in refrigerator until set. Dissolve strawberry jello in boiling water. Add the sugar to the jello, before adding the water. Immediately stir frozen strawberries into hot gelatin. Chill until it begins to thicken. Spoon carefully over the marshmallow layer. Chill entire dessert before serving.