I found this recipe for frosting. There are several negative reviews, however, the majority
is favorable and provide helpful hints (including refrigerating it before use).

Coconut Frosting and Filling - All Recipes


I also found this recipe. The ingredient amounts for the frosting vary slightly from the first,
and the entire cake is refrigerated instead of just the frosting.

Coconut Sour Cream Cake - All Recipes

__________________