Mix half packet of taco mix with oil and 1/2 teaspoon black pepper. Rub on salmon and allow to marinate anywhere from 30 minutes to 48 hours, this step is not mandatory but doing so will allow the flavors to marinate into the salmon. Place salmon on a hot grill and allow to grill for 3-4 minutes on each side. Overcooking the salmon will make it hard.
While the salmon is on the grill arrange the soft tacos by spread about 1 teaspoon sour cream on each taco. Add the lettuce, avocados, tomatoes, onions, and jalapenos. Add hot salmon and top with corn and about 1/2 teaspoon of sour cream.