Mamook Pears- like... from MAMOOK?

[Enkidoh]

Sadly, it is just your imagination - Hydaelyn is not Vana'diel, they are two totally different worlds, and SE specifically stated this during a past Q@A session for one of the Live Letters which seems to have disappeared (which used to be found on this link, but I saved the post by Bayohne in question for posterity:

Q55: There are a lot of names from Ivalice such as Dalmasca, Belias, and Zodiak that have been mentioned, is there some connection between Hydaelyn and Ivalice?

A55: To be absolutely clear, there is no connection between FFXIV’s Hydaelyn and FFXII’s Ivalice. Likewise there is no connection with FFXI’s Vana’diel. Each are their own individual world. Based on this, there are connections between the things that appear in the world, and we’ll be revealing more in the future.

So yeah, the use of Mamook and mamool'jaa in FFXIV are just fanservice fluff that doesn't mean FFXIV's world is the same as FFXI's (and the final nail in that coffin was the FFXI crossover event featuring Shantotto, she specifically mentions that she comes from 'the Federation of Windurst in the world of Vana'diel', and clearly speaks of Eorzea/Hydaelyn as a totally different world - and that she arrived in Hydaelyn via interdimensional travel). So yeah, that pretty much cements the fact - Hydaelyn is not Vana'diel, or any other FF world - it is it's own individual world.