I would have had a hogsback feature as very much a flat top sitting upon a peak or ridge...
...The hole that plays along the ridge at Rye... How is that fairway shaped?... Is it flat with fall offs on both sides?... I suspect it must be to hold the ball... pretty much the same way a section along the centerline of the first Biarritz plateau would look.... Plus, have you ever looked at an actual hog's back? Broad and flat.
Then again, if the 5th at NGLA depicts a sharp ridge, is named hogsback and is a CBM hole, then that's pretty conclusive - have you a photo?