The teacher _____ at the boy making the noise.

When someone expresses disapproval or annoyance, especially by making a wrinkled expression on their face, 'frowned' is the correct verb. 'Rebuked' is too strong and formal (implies scolding), 'grumbled' means complaining in a bad-tempered way, and 'ridiculed' means mocking - none of these capture the silent disapproval indicated by a facial expression.