They do come out of the marsh...I think we should call them Marshals.
If they did, they'd probably need snorkels. You know, what with marshes being wet and all.Do they have warrens in the marsh?
It also fits the whole "war-" theme that's going on with the warlords, warforged and warlocks already running around....marching up to them and introducing yourself as "Hi. We are Warren", well they'd fit right in.