Preheat oven to 375°F. Spray a 12-muffin tin with the cooking spray. Press 2 wonton wrappers into each cup in the muffin tin. Fill each wonton cup with mango and pineapple, to 3/4 full. Combine the nuts, flour, ginger, sugar and salt in a mixing bowl. Add the butter or margarine to the nut-flour mixture; cut it into the dry ingredients using a pastry cutter (or use two knives, cutting through the mixture at cross angles) to make coarse crumbs. Top the fruit with the nut-flour-butter mixture. Bake for about 25 minutes until golden brown, or just bubbling. Serve warm. Garnish with the edible flowers,if desired.