Yawning 'frequently' is a little unusual, but snakes are not robots, "all the same", any more than we are. As I told you previously, snakes re-align their jaws by yawning- & in the absence of other (RI) symptoms, I wouldn't worry about it. It's possible he's doing this for no reason, or because a tooth is out of whack, but I SURE wouldn't risk him getting stressed on a several day trip to a vet+ , risking him going off eating because he's still pretty new with you. Eating & keeping stress low so a snake's immune system functions at it's best is really what you should focus on. You're a new snarent, & so far, he's eating well- so don't mess it up.Don't invent trouble that isn't there.