Hey, I just posted on a similar thread to this -- my experience with my baby BP sounds like this. She would make a chirping or clicking or squeaking noise, only once in awhile. Most often when I was handling her or while she was in shed.
What I did to ease my mind was take her to the reptile vet for a normal base line checkup, it didn't cost much and she was in perfect health, so I figured her chirping was like a mini-hiss: i.e. irritation with me.
So to help feel better it's always a good idea to have that initial vet check-up and to find a vet who's experienced with reptiles, get her on file with them, etc.
Anyway that was my experience, mine hasn't made that noise in ages now that she's bigger and more confident. Which means less anxiety for me!