Not exactly, although many styles of ball stretchers or cock rings may include both a cock ring and a ball stretcher. You can find of cock rings that also include a ball stretching loop but in many cases, these will be quite thin and will only offer a small amount of stretch.  If you are looking for a stretch that will offer a lot of stimulation, you might want to go for something that focuses solely on stretching. Of course, you can also use a cock ring at the same time if you want to get the benefits of a cock ring too.