I thought geese honked and snakes hissed?
Geese hiss a lot louder than snakes. They sound like angry cats.
Believe me, geese hiss. It's their equivalent to a rattlesnakes rattle. It means "back off dude!". They can be aggressive, but as indicated above, they can be herded off, as long as the goslings are mobile. If they aren't yet, stay away.