Not that I recall. Part of the problem though is Siptah is a lot heavier on the RNG for things, so it may just be a matter of dumb luck to get that stuff on your list.
Abysmal fangs can be harvested from the little slug adds that spawn when fighting the blood moon beast though that’s definitely not low level stuff. There are a number of those slugs mixed in with the locusts south of the tower though I have no idea if they also have the fangs.
The named bat demon above the judge may give hollowbone arrows but I can’t confirm it. Also not a low level thing either.