Most of the fake chicken products I see in US supermarkets and health fraud stores contain wheat gluten, concentrated poison for us celiac sufferers.
There is an online vendor in Texas called
Dixie Diner that offers dry soy based meat analogs that are not so bad. You need to reconstitute them with water, and then they have a fairly convincing texture. they are pretty good about providing information on which of their products are GF.
Unfortunately my vegan husband has become sensitized to these products and we no longer use them at our house.