That is funny....likely taste yummy...but I would be most concerned that your dog does not every come upon him doing this...also...I wonder if you should just get him his own---I don't know that I would feel comfortable having the canine placing the bone back in his mouth after it was slobbered on by a reptile--you know what I mean....
The only prob then that I would have is potential impaction if the tort gets a piece small enough to swallow but too big to pass...hmm, going to be a judgement call on your part seems to me....