Heat a medium skillet over medium-high for 2 minutes. Add the dry corn in one layer and cook for 5 to 7 minutes, stirring twice, until spotted brown. Transfer to a plate to cool completely.
Blend the avocado, yogurt, lime juice, cilantro, salt, and 2 tablespoons cold water until smooth. Add more water 1 tablespoon at a time until pourable. Cover and refrigerate.
Combine the cooled corn, cabbage, onion, cilantro, and jalapeño in a bowl. Set aside the lime juice, oil, and salt — do not dress the slaw yet.
Toss the patted-dry shrimp with 1 tablespoon oil, lime zest, garlic, paprika, cumin, ancho, salt, and pepper until evenly coated. Cook immediately.
Heat the large skillet over medium-high for 2 minutes and add ½ tablespoon oil. Cook half the shrimp in a single layer for 2 minutes, turn, and cook 1 to 2 minutes more until the thickest part reaches 145°F and looks pearly and opaque. Transfer to a clean plate. Add the remaining ½ tablespoon oil and repeat with the second batch.
Toss the slaw with lime juice, oil, and salt and rest for 5 to 10 minutes. Wipe the medium skillet and warm tortillas 20 to 30 seconds per side, keeping them stacked in a towel. Spread about 1 tablespoon sauce on each tortilla, then top with slaw (drained of liquid), shrimp, radish, and a squeeze of lime.