*Look for pork in plain, not smoky, barbecue sauce. Substitute chicken in barbecue sauce, if desired.
Combine pork and chili sauce in medium bowl. Split biscuits in half. Roll or stretch each biscuit into 4-inch circle. Spoon 1 tablespoon pork onto center of each biscuit. Gather edges around filling and press to seal.
Generously butter 2-quart baking dish that fits inside of 5- to 6-quart Crockpot™ slow cooker. Arrange filled biscuits in single layer, overlapping slightly if necessary. Cover dish with buttered foil, butter side down.
Place small rack in slow cooker. Add 1 inch of hot water (water should not touch top of rack). Place baking dish on rack. Cover; cook on HIGH 2 hours.
Meanwhile, prepare Dipping Sauce. Garnish pork buns with green onions and serve with Dipping Sauce.