Cranberry Ambrosia

1 can sweetened condensed milk
1 (20 ounce) can crushed pineapple, drained
1 can whole berry cranberries
1/2 cup lemon juice
1/2 cup chopped pecans
1 (8 ounce) container Cool Whip

Mix all together. Put into a 9 x 13-inch pan and freeze.