Preheat oven to 425°.
To prepare mango salsa, combine first 8 ingredients in a bowl; cover and chill.
To prepare deviled seasoning paste, combine mustard and next 8 ingredients (mustard through black pepper) in a small bowl. Remove and discard giblets and necks from hens. Rinse hens with cold water; pat dry. Starting at neck cavity, loosen skin from breasts by inserting fingers, gently pushing between skin and meat. Lift wing tips up and over back; tuck under hens. Rub deviled seasoning paste under loosened skin. Place hens, breast sides up, on a broiler pan. Bake at 425° for 35 minutes or until juices run clear. Split hens in half lengthwise. Discard skin. Serve with mango salsa.