There's only two Argonians in Windhelm you could marry; a male and a female. There's a third one you could marry, but you kind of have to work to access him (I think it involves working with the Blades).
There are no Argonian children anywhere in the game (every child you'll see will be human). --- http://www.silvermelee.deviantart.com
I wish there were Argonian hatchlings in this game. It sucks that all you can adopt is spoiled human children.
No Argonian hatchlings? You humans are all racist!
I think you mean speciesist.
But it's not really your fault. You are just boots, belts and jackets that learned how to talk, after all. --- "We get serious about fictional girl underpants, and kid around when it comes to topics like world hunger." ~Teepo on CAGN