No, the jaw of the blue-tongue skink is not capable of tearing and piercing. Therefore, it’s least likely of a skink to bite your finger off, but the grip of the skinks can be quite hard on the bones and skin. So, if a skink has caught your finger in its mouth, do not snatch pull your finger, as the firm grip will have the skink come with you, and it’ll be a lot of weight hanging from your hanging that can cause serious injury.