I've never seen one. Plenty of halflings (which seem to be the ideal race due to guile/cunning), humans, dwarves, and discussion of half-orcs, although they've seemed to largely fall out of favor (or, at least, off the top of the list in terms of discussion time) after the initial rush.
Is there some reason for a lack of warforged rogues, beyond flavor, at least? They seem to be better set up for a pure rogue build than the more common dwarves.