1. Whisk teriyaki sauce, sugar, and ginger in a small bowl until sugar dissolves. Line a jelly-roll pan with foil.
2. Place a scallop piece on one end of a bacon slice; roll bacon around scallop. Repeat with remaining bacon and scallops. Dip each in sauce and arrange rolls 1/2-inch apart on prepared pan.
3. Heat broiler. Broil rolls 6 inches from heat until bacon is lightly charred on top, 5 minutes. Discard any juices that accumulate in the pan. Turn rolls and broil until bacon is cooked through, about 3 minutes more. Insert a toothpick in each roll and serve warm. Makes 20 rolls.