It may not be thrush, if it comes off it's just milk build up or just because he's not well kwim? I know my tounge can get a bit hairy when I'm sick. Just ask the pharmacist what they think though and get some daktarin JIC it is thrush cause that's the last thing you need to deal with right now. The euky bear rub is just vicks for babies and kids. I just use vicks cause it's always what I have on hand