This wicked looking tree trunk is Hercules Club. I have these growing on my homestead, but they are younger than this fine specimen. Hercules club is also known as "toothache tree". A little of the bark is applied to sore gums to kill pain.
I don't make a habit of eating tree bark, except for cinnamon, but I have tried this tree's bark on the tongue and it has a definite tingly, numbing sensation.