Frozen Hawaiian Pie

1 (14-ounce) can sweetened condensed milk
1 (12-ounce) container frozen whipped topping, thawed
1 (20-ounce) can crushed pineapple, drained
2 tablespoons lemon juice
1/2 cup mashed ripe banana (about 1 large banana)
1 large orange, peeled and sectioned
1/2 cup sweetened flaked coconut
1/2 cup chopped walnuts, toasted
1/2 cup maraschino cherries
2 (9-inch) ready-made graham cracker crusts
Garnishes: chopped pineapple, maraschino cherries, chopped walnuts, whipped topping, toasted coconut, fresh mint sprigs

RECIPE INSTRUCTIONS Stir together condensed milk and whipped topping. Fold in next 7 ingredients. Pour evenly into graham cracker crusts.Cover and freeze 12 hours or until firm. Remove from freezer, and let stand 10 minutes before serving. Garnish, if desired.