Thaw shrimp either in the fridge or in a colander under cold running water. Place shrimp on a plate and pat dry with a paper towel.
Set up the dredging station by cracking egg whites into a bowl, spreading the all-purpose flour on one side of a plate and the panko on the other side.
Season the panko with 1 tsp salt and ½ tsp black pepper.
Coat the shrimp first in the flour, shake of excess, dip in the egg white and then coat in panko, shaking off excess. Place on a clean plate.
Heat a large skillet over medium heat for 5 minutes. Add a thin layer of avocado oil (you want there to be a layer of oil for the shrimp to fry in) and allow to heat for another 30 seconds.
Place shrimp in the skillet, being sure to not overcrowd (you may need to do multiple batches) and fry on each side for 2 minutes or until golden brown.
To make the Chipotle Lime Crema: in a bowl, mix together the Greek yogurt, juice of 1 lime, 1 tsp chipotle powder (or use hot sauce of your choice) and a pinch of salt.
Assemble tacos with warmed tortillas, cabbage, avocado, crispy shrimp, chipotle lime crema, thinly sliced radishes & cilantro.