Preheat oven to 400 degrees F. Line a baking tray with parchment paper. Place cod on tray and rub all sides with shallot oil and taco seasoning. Place tray into oven and bake 10-15 min depending on thickness (cod will be done when opaque white).
Meanwhile, combine all Avocado Mango Salsa ingredients in a bowl. In another bowl, combine sour cream, lime juice, and 1 tbsp taco sauce. Stir well to combine.
Heat corn tortillas according to package directions. Divide cod among tortillas. Top with remaining taco sauce, medium salsa, and avocado mango salsa. Top with sour cream sauce and cilantro. Serve with lime wedges.
