We know the Horn of the Goblin General summoned a few Goblins that stay till death/defeated.
Is that possible with the Staff of AOG? We know the Staff can once a day summon Primal Fire Elemental and Moonlight Wolves (presumably once). We can assume that the other jewels in the snake's mouths also have amazing affects and summons such as the possibility to summon: Primal Earth Elemental, Primal Water Elemental, Primal Star Elemental, Primal Air Elemental, etc.