Dissolve Jell-O Gelatin and salt in boiling water. Drain pineapple, measuring syrup; add water to make 1/2 cup, if necessary. Stir into gelatin with lemon juice.
Blend in mayonnaise. Chill until very thick. Whip cream. Fold fruits, nuts, and whipped cream into gelatin.
Pour into 2 freezing trays or a 9x5x3-inch loaf pan. Freeze until firm-at least 3 to 4 hours.
To serve, cut in squares or slices. Makes about 4 1/2 cups, or 8 servings.
NOTE: Other fruits that may be used in the Frozen Fruit Salad are: drained diced orange sections, drained canned crushed pineapple, or drained canned fruit cocktail. using a total of about 2 cups fruit.