yes they do grow back
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Yes. It's called a molt. They begin to lose their feathers soon after the goslings are born. They take the entire family to safe area (dense area in a forest preserve) so they can molt without fear of being killed.
Yes. Missing plumage will grow back unless the base is damaged or removed. Regions of the skin from which feathers grow are called pterylae.
Spring, mainly. Some might grow them a little earlier or later, some might just skip a year. But mainly, Spring.