Spray a 9 x 13 casserole dish with non stick spray.
In casserole dish mix together strawberries, rhubarb, 1 cup of sugar and tapioca flour. Mix well.
In a separate bowl combine flour, rolled oats, sugar, brown sugar, cinnamon, salt and butter. Mixture should be crumbly.
Sprinkle oat mixture on top of cherry rhubarb mixture.
Bake for 35 minutes, 5 minutes more for frozen cherries. Mixture should be golden on top and bubbly.
Allow to cool for 5 minutes then serve with either vanilla ice cream or whipped cream.