Bring a large pot of lightly salted water to boiling. Add linguine and cook 9 minutes. Stir in snow peas and carrots and cook another minute. Drain and rinse under cold running water until cool to the touch.
Transfer linguine mixture to a large bowl. Add turkey and scallions. Pour the peanut sauce over the top, then add vinegar to peanut sauce jar. Screw cap back on and shake jar. Pour contents over linguine mixture, toss to coat completely with sauce and serve.