Place chopped cherries on paper towels to absorb moisture; set aside.
Mix together the sour cream, sugar, lemon juice, and salt; stir in pineapple, walnuts, and cherries. Stir in chopped banana. Spoon into paper-lined muffin cups and freeze until firm. Let stand at room temperature for a few minutes to soften just slightly.
Serves 8 to 10
Calories per serving (based on 8 servings): 257