Make sure shrimp is thawed and pat them dry. Toss with 2 tbsp olive oil, spices, salt and pepper. Stir well to coat. Set aside.
To make the mango salsa, chop the onion, jalapeño, cilantro, and dice the mangoes. In a serving bowl, toss together with juice of one lime. Season with salt and pepper to taste. Set aside until ready to assemble the tacos.
In a skillet, heat 1 tbsp olive oil on medium-high heat. Add shrimp to skillet and spread them out in an even layer. Cook about 3 minutes on each side (until opaque in color). Transfer to a plate immediately (to avoid over-cooking).
Spoon shrimp into warmed tortillas and top with mango salsa. Enjoy!