Empty mandarin oranges, pineapple chunks, and cut pear halves into a strainer over the sink. Let the fruit sit in the strainer for 15-20 minutes, tossing the contents periodically. Fruit is ready once it's been thoroughly drained of all excess juice.
In a large bowl, mix together marshmallows and greek yogurt.
Pour in the fruit with the yogurt mix and gently toss with a spatula until thoroughly mixed.
Cover bowl (or move to a sealable container) and chill creamy fruit salad in the refrigerator for at least 2 hours. Keep chilled until serving.