There's no special name for them. There's hardware that allows one to mount most TV's to the wall, but I don't know of any TV designed for wall mount only. Mostly, the ones used are flat-panels of either LCD or plasma varieties, but occasionally, a screen is used in combination with a projector.
Doesn't he mean those small television sets that have digital capabilities integrated in? Like a 15" I think they are called "LTV"?