With dinosaurs I suppose it might be a possibility with some kind of a blow torch effect which would not contact tissue of the mouth with no contact, but that's as far as I go.
Just to entertain the possibility, in your organic blowtorch effect, what's the ignition source?
While I don't for a minute believe that fire-breathing dragons have any basis in reality, if I had to suppose a real-world organism with some kind of fire breath attack, I'd suggest an effect akin to bombadier beetles - a hot chemical spray.
Then again it wouldn't surprise me if Hovind believed that it just worked by magic.