Drain pineapple juice into a medium bowl; set pineapple aside. Add bananas to juice. In a large bowl, combine cranberry sauce and sugar. Remove bananas, discarding juice, and add to cranberry mixture. Stir in pineapple, whipped topping and nuts.Pour into a 13x9 pan. Freeze until solid. About 3 hours. Remove from the freezer 15 minutes before serving.