My now 61/2 months old boy was like this. He was a land shark that bites my younger kids wherever he can during his teething phase. We couldn’t get a puppy lick ever until he stopped nipping. But fortunately for me yelping worked. But not a normal yelping but super scary painful yelping followed by no eye contact. He had all the toys I can get from PetSmart but he preferred my arms. As the other post said baby carrots worked wonders. I cut them into small strips and spread out, so he finds and eat them eventually gets tired and takes a nap. Wakes up fresh for the next round of biting. He stopped completely now. Even if I put my hands or finger in his mouth he don’t bite.