Huh? Yth heads? Let me look up their description...
Hmm, I think I know where that went wrong. In regards to the size of an yth's head, what I meant to say when I wrote it was that they were able to fit a man's head through their maw - that is, the head from top down would fit through their mouth and feed straight into their throat without the need to carve it into pieces first - not that a man's entire head could be in their mouth at the same time. The mouth is big enough to fit the (what to call the dimensions of a human head...) width and length (?) of a human head between its jaws, but not its height (???). Meh, you know what I mean. The head will still be big, but not [I]that[/I] big. I don't know what I was thinking with the fangs, though... might have confused inches with centimeters or something right at that moment, because seven inches sounds like a lot. It'd be more like three or four inches, I think.
Concerning their stockiness aside from the size of their heads, the point I described as being the thickest, at ten inches, is their "chest" area (where the arms are connected), which is relatively compact, actually... The tail would be significantly thinner (immediately beneath the "torso" it would slim down to six or seven inches, and then continue to slim towards the point from there) and its throat (unexpanded - their proportions expand when swallowing large objects, obviously) would be around eight inches thick.
...I think.