They're totally edible. If we were in a crisis and the closets and kitchen weren't working and you'd had the good sense to buy a Thneed before I got robbed, you could definitely eat it.

[Granted he doesn't recommend eating Thneeds as part of anyone's diet, but that's mostly because his mother his totally professional definitely-has-a-degree-in-something lawyer said it wouldn't be wise to advertise that.]

Well, I got them from the vendors. I bought them myself the first time, and after that whole mess with my Shadow...well, that doesn't matter. What matters is that they're gone and I'm not stupid enough to go buy them a third time.