Frodo's Barrow Dilemma

[Gothbogg the Ripper]

I doubt they would have seen him. Whereas the Ringwraiths were cunning enemies and the cream of Sauron's crop, the Barrow-Wights were merely puppets. Called up by the Witch-King if I am not mistaken.
And whilst the Nazgul were neither dead nor alive, the Barrow-Wights were most certainly dead. So, no ring-vision for them!