Place pineapple chunks and oranges in a strainer and set aside, approximately 45 minutes to drain. Drain cherries, rinse in cold water and set aside with other fruit to drain.
Using a stand or hand mixer, whip heavy cream, sugar and vanilla until stiff peaks are formed. Fold in half of sour cream until mixed then add remaining being careful not to deflate whipped cream. Add coconut and marshmallow to mixture and stir gently.
Add in fruit and nuts, stirring to incorporate. Cover and chill until ready to serve.