Soak bean thread noodles in warm water 5 minutes, drain, and cut short.
Pound garlic, peppercorns, and coriander roots into a fine paste.
Heat oil, cook garlic paste 1 minute. Add ground pork and cook until done.
Stir in noodles, carrot, cabbage, and fish sauce. Cook 3 minutes. Cool completely.
Place filling on wrapper, fold like an envelope, roll tightly, seal with flour paste.
Preheat air fryer to 390F. Spray basket and spring rolls with cooking spray.
Air fry 14 minutes, turning halfway, until golden and crisp.