I hate to bump this, but I feel as though my question has gone unanswered or has been too vaguely answered.
Do the Argonians reproduce outside of the Black Marsh? If so, do they take the form of their parent? or do they grow as common reptilians?
I think folks are sorta avoiding your question - what the dev-stuff 'hints' indicate (maybe states?) is that the Hist change Argonians. We know that both Hist and Argonians are intelligent.
If Argonians were not born or were born unintelligent then that would be in the Lore in-game and clear because neither the Dunmer nor the Imperials could avoid noticing that. It would be just too important to ignore or pass by. So we are left with more subtle possibilities.
Knowing that the Hist had a civilisation - an Empire of their own we can see them as not only intelligent but also manipulative - either directly and/or through their agents - that is where I see the Argonians coming in.
The how of such a thing is totally open to speculation until the Devs pronounce so my concept is that the Hist Sap changes Argonians in ways that Hist find desireable and once the Hist have done this Argonians in their own society become
elligible for marriage - however outside Hist regions of influence argonians being self-motivated, intelligent beings, complete in themselve sca live and reproduce as they please.
I have ideas about Hist - come visit the Provincial Library at The Wormhole (linky in my sig) if you like.
About the size of the Hist and other connections - please do not confuse Hist with Graht Oaks = see Dance in the fire re the mile high City of Falinesti - sometime described as the Capital of Valenwood.
I have a Dawntime story about a possible connection between Hist and Graht Oaks ... likely a fiction - honest! Thing is that the Great Spirits of the Dawn appear to have been trapped in the Grey Maybe = Nirn and I feel that they were not only trapped in the sense that they could not extricate themselves, but they were also bound by the nature of the Grey Maybe to conform to certain of its lawsto a great extent.
Those spirits seem to have been both immortal and amorphous - so something (perhaps their own lack of understanding about what they were getting into and letting themselves in for when they entered the Grey Maybe) seems to have forced them to take on likenesses of the forms that already existed in the Grey Maybe - so it may be that mer are spirit-parts that took on man-like forms and Hist took on the form of Graht Oaks - or the other way around - depends where they first originated eh?
NB
(small print) Please don't misread this mix of fact and speculation - the speculation has qualifiers like 'perhaps' and 'maybe' to indicate that I am trying to draw conclusions from incomplete material - and that's where you are left. Because the fact is that the Elder Scrolls are alive and changing! Only 'stop' is dead. So there is always more :icecream: