5a Hmmm - Baobab - 'B(achelor of) A(rts) + o(ld) b(oy)' (2 students) + 'a b(ook)' - which works if the clue should read "...written by..." I can't find a definition yet.2d Ogrish - 'go' (work, upset) + 'rish(i)' (Vedic poet, abrupt; short)Best I found was -https://lotr.fandom.com/wiki/Earth-kin
2 Rishi is a Hindu poet so leave off the last letter to fit abrupt. I don't know how go-upset so OG. It looks like your answer is right because Jorthkyn is an ogre. Best I can do.
I had them both but really just bunged them in hoping for the best, so good to have them confirmed & explained. This puzzle was quite tricky for a Talos imo