Hi,
My beardie hasnt made any sounds but i would think they would if they are extremely mad/upset they would start making hissing sounds. If they have some kind of respiratory infection they would have some wheezing/coughing sounds too.
When they lick their chops at mealtime it sometimes makes a sound. If they get angry they can make a slight hiss if they clear their lungs at once. Other than that they are quiet and stealthy. They are visual communicators rather than verbal.