It’s unlikely that you’ll hear termites in your walls. While you might think that an infestation of thousands of these little buggers could mean that you’ll hear scuttling within your walls, you’d be surprised at how silent termites are. Unless termites are actively swarming, you probably won’t hear them in your wall cavities. In rare cases, you may hear a very light slight tapping caused by soldier termites using their jaws to communicate with other termites.
Once again, if you suspect termites are in your home, it’s best to have a professional inspection.