3 cups diced seedless watermelon
1 cup frozen mango
1 cup sweet white wine (such as Cupcake® Angel Food™)
1 cup ice cubes
1 cup white rum (such as Bacardi®)
1/4 cup light agave nectar
1/4 cup lemon juice
1 tablespoon clear mint syrup (such as Monin® Frosted Mint Syrup)
Place watermelon, mango, wine, ice cubes, rum, agave nectar, lemon juice, and mint syrup into a blender; puree until punch is smooth and frothy.
Strain punch into a pitcher. Refrigerate at least 1 hour.