I was mistaken earlier, its more like a white mold with a tint of pale blue. I've been boiling it for about two hours now, but it's been about an hour per side since the pot isn't quite big enough. It looks like most of the mold may have come off, but then again, I could be wrong (minus one patch right in the middle of the driftwood). I've also been trying to look up stuff on mold on driftwood, and I've been seeing that it's supposedly a natural occurrence and not harmful to the frog? If this is the case, I may try to clean it off and put the log back in.