In a blender blend 2 tbsp of sugar and mangoes into a smooth purée and set aside.
In the same jar add another 2 tbsp of sugar and mulberries and blend it into a purée. Seive it and set it aside. Do not add water while blending the berries.
Layer the mango purée , mulberry purée and yogurt mixture. Because the purées are so dense, they will not mix with each other. Once layered, insert a skewer and make swirls, lightly. Insert the sticks and freeze them overnight