Argonians to me represent the least understood of the races. We can make a few guesses about which tribe we play. I assume we can quickly rule out any of the Inner Tribes (The Agacephs, The Paatru and my personal favorites The Sarpa.) Of the five races we (I) know about we've only got two left, The Archeins and The Nagas.
The Nagas are not the Tribe we play in game. They are described as seven to eight feet tall and with huge mouths dripping with needle like fangs. This is definately not what we're used to playing in game, the Argonians we play as stand at roughly the same height as Imperials not Altmer.
The Archeins are the Tribe that, during the time other races attempted to colonize Black Marsh, sold other Argonians into slavery. During this time they became powerful and wealthy. However when the other races gave up on the plantations they took with them the Archeins source of income. This new found bankruptcy could have been enough to force the Archeins out into the other provinces seeking a new source of wealth.
However this doesn't solve the problem. Leaving us with two possibilities.
1. The Argonians we see in the games are from a larger, unnamed and undescribed tribe that lives in the outer reaches of Black Marsh, therefore familiar with other races and not skittish, and is populace enough cope with the losses to their number incurred through extensive slavery.
2. Or they could be a generic Argonian who are a muddy blend of the other Tribes with none of the usual obvious marking factors.
Personally I bend towards the latter explanation. But I've tired myself out with a long (for me) post which is mostly pulled from my ****. Feel free to point out my obvious mistakes.
Oh yeah and there's the Hist licking thing. Damn confusing Lizards.