Naggoob is the Father of Ghouls and the free lead servant of Nyogtha, according to the Unaussprechlichen Kulten. (EXP: "The Horror in the Gallery") As such, he might be related to Nug, Feaster Among the Tombs, who the Book of Eibon identifies as the grandfather of all ghouls who serve Nyogtha. (EXP: "The Descent into the Abyss")
Behind the Mythos[]
Naggoob was created by Lin Carter for his 1976 story "The Horror in the Gallery", and classified as one of the Lesser Old Ones.
As the "father of ghouls", Naggoob might be associated with Shaurash-ho, a a descendant of Nug through Cthulhu, and the ancestor of Yogash the Ghoul according to H. P. Lovecraft's Family Tree of Azathoth.
By stating Nug to be grandfather of the same ghouls in his 1980 story "The Descent into the Abyss", Carter might have intended to harmonise Lovecraft's family tree with his own lore, perhaps suggesting a connection between Shaurash-ho and Naggoob, as both are related to Nug and the ghouls. Several possibilities exist, such as "Naggoob" being simply the Hyperborean name for Shaurash-ho.
Alternatively, it's also possible that Shaurash-ho mated with Naggoob, or with one of his descendants, and gave birth to Yogash the Ghoul, since there is no indication that Naggoob himself descends from Nug, only that the ghouls descend from both.
Naggoob is not to be confused with Nagob, a mysterious character mentioned in "Out of the Aeons" who, in 1932, was believed to be in possession of the genuine scroll of T'yog.