Another thing you can do- squat down or sit by them. They are not threatened when you get down on their level. You have to be careful of ganders though- I have one that will try to climb on my back if I am not looking
Mine seem to do the same yell when they or one of their buddies has become separated from the group. Especially mates- boy they really raise heck then. When there are babies present, this does not happen. I just assume its because they don't want to attract predators.
I'd rather have a gander that gets a little salty during breeding season than a bantam roo with Napoleon syndrome 12 months of the year!
I think raising them from day 1, even if its as a partnership with the flock, is essential to becoming fluent in goose.