I think what you've been hearing is normal...because it's only when you're holding him or he's climbing on you. That's why I suggested making sure by checking
him for the same sounds when he's just laying quietly & apart from you. You're obviously a caring owner& I'm glad you asked, but I don't think you need to
worry about this. These sounds are more noticeable in bigger-bodied snakes...I've been living with snakes for many years.![]()