Heat 1 tbsp neutral oil in a large skillet over medium-high heat. Cook pork, breaking it up, until no longer pink, 4–5 minutes.
Add cabbage, carrot, garlic, and ginger. Stir-fry until vegetables soften and release moisture, 3–4 minutes.
Stir in soy sauce, fish sauce, sesame oil, salt, and pepper. Sprinkle in cornstarch and cook 1 minute to thicken slightly.
Remove from heat. Fold in green onions and let the filling cool until just warm to the touch.
Set up a rolling station with a shallow dish of warm water, a damp towel-covered board, and a plate for finished rolls.
Dip one rice paper in warm water for 8–10 seconds. Lay it on the damp towel, add about 3 tbsp filling near the bottom edge, fold sides in, and roll tightly.
Repeat with remaining wrappers and filling. Keep rolled pieces covered with a damp towel to prevent drying.
Heat remaining 2 tbsp neutral oil in a nonstick skillet over medium heat. Pan-fry rolls seam side down, turning, until crisp and golden, 2–3 minutes per side.
Drain on a rack or paper towels for 2 minutes. Serve hot with your favorite dipping sauce.