If they have small, simple teeth, it should be possible to pack in so much. It could be like a dolphin and swallow food whole, without chewing. Or it could be like a giant armadillo, which feeds on soft-bodied things that need little chewing.
In real life, wood is generally not as dense as bone.
this discussionThis discussion states that a human skeleton made of a particularly strong (that is, hard) kind of wood, black ironwood, would only be 70% as strong as a normal human skeleton.
Orphan Scimitars mostly eat small plents, with wooden bones that would likely snap like twigs or small sticks under its jaws, and some small "normal-bone" organisms. If it has little need for chewing, it wouldn't need complex teeth, and so could have small, simple ones, and so could have a lot. I'm not sure whether small rodent-like plents are really equivalent to the bugs giant armadillos eat, though, and surely the larger ones would have bones tougher than the fish and squids dolphins swallow whole.
I just realized...there are a lot of organisms that eat plents, but how many can actually digest wood? Wood is very hard to digest. Do they eat around the bones? Do they spit up bone fragments? Can they handle the occasional nodent twig-like bone but not, say, dualtrunk leg-bones?
Exactly which organisms should remain in its diet may be up to further calculations, but I'm not sure how it would handle Gulperskuniks, which are well-armored even if it's just cellulose.
There are various formatting errors. I'll have to go over those later.