Alligators do make noises. The best way to describe these noises is a rumbling bellow or a deep growl, almost resembling an echo.Alligator’s may use these types of noises when they feel threatened or are acting aggressively to try and protect themselves or their young.n addition to these types of noises made, alligators when they are young and ready to hatch, are known to emit a high pitched croaking noise that is often referred to or described as a “yerp”. This yerping sound stimulates the eggs of other hatchlings.