Yes - acupuncture can help frozen shoulder and chronic shoulder pain.
I commonly see very tight shoulder muscles in frozen shoulder patients. This can include any of the muscles that attach to the shoulder. My approach to this condition involves using a combination of traditional acupuncture points as well as incorporating trigger point release in any muscles that are involved.
I generally look for knots or trigger points in the following muscles:
infraspinatus, deltoid, scalene, supraspinatus, pectoralis major/minor, biceps, corachobrachialis, and latissimus dorsi.
Releasing any tension in these muscles will help reduce shoulder pain and increase range of motion because they all attach into the shoulder area. When a muscle is tight it pulls on the attaching structures which can result in pain and restricted range of motion.