There are cock and ball toys known as stretchers. Depending on your anatomy, they may, or may not work, and this takes time, as you're essentially trying to alter your anatomy without damage to tissues or organ structure.
Learning to use these devices takes patience, caution, and time. The effects are not permanent, so you have to continue the practice to maintain any gains. This is one of my early examples, using a neoprene cock and ball strap/spreader/stretcher, and a stretching exercise.
You can't increase the size of your balls, other than through techniques involving injection of sterile saline, or more dangerous methods. That's genetic. You can stretch your scrotum, spermatic cords, etc. slowly over time to achieve a less tight, more hanging effect. It takes dedication and time.
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