I've read at least two sing: Yellow and American Redstart, according to Kimball Garrett's and Jon Dunn's "Warbler Field Guide" (Houghton Mifflin, 1997).
(Yellow Warbler above is a male; below is a female Yellow Warbler. Both sing.)
This guide is excellent and an essential companion for warbler enthusiasts.
Since its publishing date in 1997, it's possible more female wood-warbler species have been detected, though I've not read about any new discoveries.