Mix pineapple, oranges, sour cream, marshmallows, and coconut together in a bowl. Cover bowl with plastic wrap and refrigerate until flavors blend, 2 hours to overnight.
You CAN serve the salad immediately, but I recommend letting it set in the fridge for a few hours as it lets the flavors combine and taste even better. You can make this recipe healthier by using fresh fruit and low or reduced-fat sour cream (which we do), but I do not recommend omitting the marshmallows unless you have your own substitution that can pick up the texture. For more flavor you can add a dash of cinnamon or nutmeg to taste.
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