Not Specialized. Ergon make some for swept back bars. I'm using standard Ergons on a Gusset Stash bar (35 degree) but they're getting a bit old. Tempted by some of the Ergon swept back specific (30-50 degrees) but yet to find anyone who uses them.
The sweep-specific ergons seem dumb. They just position your hand/wrist at the same angle as you would be if you had a normal flat bar, but just moved backwards a bunch. Seems like an expensive way to cancel out the benefit of the you swept/angled bar...
Haven't tried the specialized option but the regular Ergons have been comfy as hell on my bikes, most with bars at a 45ยบ sweep or so.