Is minor pain in chest or throat normal after flexible scope laryngoscope ?

Yes: Not just the laryngoscope, but also the medicines u got for sedation / anesthesia can dry out the throat & esophagus (food tube) causing temporary minor discomfort, especially after chewing or swallowing. It shd go away in 3-4 days. If it persists, or gets worse in this time frame, then talk to the ENT surgeon who did the laryngoscopy 2 explain. (More specifically, what did s/he find? Any biopsy?)