Bynny Ribbit 
Re: Deformation cause?
Got back from the vet with Truffle! He gave her a good bill of health, said there wasn't any abnormalities to worry about inside her mouth and her bone density felt good. I inquired about if tong feeding could have injured her at some point and caused it, but he's doubtful of that as there likely would have been other signs if she got hurt. As for her crossbite, it's going to be a sit and wait situation. He said if it gets worse, sedating her and x-rays could be in order, but since she is doing so well despite her misaligned jaws, he would rather wait than stress her unnecessarily.
So...still a mystery! But I'm glad she's okay other than her unique features.
