Preheat air fryer to 375°F. Add frozen shrimp in a single layer and air fry 6 minutes until opaque. Add 60-90 seconds if needed.
While shrimp cooks, microwave butter and garlic until melted. Stir in Dijon, lemon juice, salt and pepper.
Toss shrimp in sauce and serve with scallions and lemon wedges.
