Things are usually best explained by examples. FolkRock is Fairport Convention, Steeleye Span, Pentangle, Mr Fox, Trees... More or less traditional music played rock-style with amplified instruments & amplification of vocals. Could be well or ill done: at its best, as with Maddy Prior & Bob Johnston & Martin Carthy & Peter Knight & John Kirkpatrick working in Steeleye, or Jansch & McShee in Pentangle (people with a background in traditional folk), it could provide fresh insights to the music — which was, after all, as they would have admitted, still there when they had finished with it.

FolkRock, like Rock in general, implies a *group* to achieve the effect aimed at.

So can't see how a soloist like Donovan would possibly qualify; even if using amplified instruments which he generally didn't (&, drifting slightly, look what happened when Dylan did!).