So while questing in the Badlands and completing the quest that purifies Wrathion's egg, I noticed something interesting. When the titan device scans the egg, it detects the source of corruption as "Azerothian Old God". Azerothian. Meaning that there are other Old Gods besides those on Azeroth. This we already new since the Burning Crusade, HOWEVER what sticks out to me is how the machine notes that the corruption is from an AZEROTHIAN Old God, meaning that their were other Old God corruption types it could have detected. What this means is that the Old Gods of Azeroth all have something in common, and extraazerothian Old Gods are somehow noticeably different from the ones we are familiar with. So what other forms could an Old God take? Well, we don't have any idea, since we never encountered an Old God not on Azeroth...or have we?
This brings us to Draenor, specifically, Shadowmoon Valley, where the Arrakoa are trying to summon an 'ancient and powerful evil'. This being had the placeholder model for C'Thun, suggesting it to be an Old God. However, nowhere throughout WoD or Chronicle has it ever been stated that an Old God had been found on Draenor. But the descriptions of the Sporemounds are eerily similar to that of Azeroth's Old Gods. If the Old Gods DID come to Draenor, how likely is it they would have kept the same form as the Azerothian Old Gods? Without a Titan to corrupt and feed on, wouldn't they need to adapt to survive?
Now, take that quote, remove the word vines, replace the words tangled 'brambles and noxious pods' with 'flesh and tentacles'. Sounds a LOT like an Old God to me, but with a different mask. The Sporemounds could even perform the Curse of Flesh, using spores to turn Grond's descendants into flesh over many generations. The Sporemounds were rooted to the ground, much like Azeroth's own Old Gods, and durning their battles with Grond, pieces of their bodies that fell became their own living creatures, just like how the Aqir and N'raqi were created from the Old Gods' flesh. The similarities don't stop there, even. The fungal creatures we see on Alternate Draenor operate in a very similar manner to Old God minions we encounter on Azeroth, using brainwashing and telepathic communication.The Sporemounds' tendril-like vines slithered over Draenor's earth and strangled every primitive beast that they could reach. As they grew, the Sporemounds consumed more and more, their hunger and need to expanding knowing no end. They blossomed into living mountains of tangled brambles and noxious pods.
So, either the Sporemounds of Draenor are either Old Gods that have taken up a different form after encountering Azeroth, or Blizzard got lazy and copy-pasted their Old God lore with some plant favor when it came to Draenor's ancient history. I don't know about you, but I prefer the former.