To an extent, and that extent is exactly as much as the GM wants it be. One of the fun things about messing around with peripheral peoples is the level of freedom.
I liked David's origin myth for the river folk, and the fish hsunchen idea.
As for the mixture of ancestry, I agree but note that this does not necessarily mean a mixture of cultural trends. In their adaptation to a riverine lifestyle with hostile neighbors, the Mru have had to abandon anything inconsistent with it, like permanent settlements, herd animals, etc. There might be some traces of ancestral folkways, such as particular clans having the secrets of growing particular grains or something. But that's of limited utility when you may have to abandon your fields at a moment's notice.
On the bog issue, I feel that broos dominate this terrain because they can just leave a pile of droppings somewhere, on a path or landing, and people have to steer clear. Plus, the people are called River Folk, not Bog Folk.
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