Thaw fish, if frozen. Rinse fish; pat dry with paper towels. Sprinkle Jamaican jerk seasoning over both sides of each fish fillet; rub in with your fingers. Measure thickness of fish.
For a charcoal grill, place tortillas on the greased rack of an uncovered grill directly over medium coals; grill for 1 minute or until bottoms of tortillas have grill marks. Remove from grill and set aside. Place fish on the grill rack directly over the coals. Grill fish for 4 to 6 minutes per 1/2-inch thickness or until fish flakes easily when tested with a fork, turning once halfway through grilling. (For a gas grill, preheat grill. Reduce heat to medium. Place tortillas on greased grill rack over heat. Cover; grill as above. Remove tortillas from the grill and add fish; cover and grill as above.) Coarsely flake the fish.
Meanwhile, in a medium bowl toss together spinach, tomato, mango, cilantro, chile pepper, and lime juice.
To assemble, place tortillas, grill mark sides down, on a flat work surface. Top each tortilla with some of the spinach mixture and flaked fish. Roll up tortilla to enclose filling. Cut each in half to serve.