A baby goose is called a gosling and is the product of a female goose and a male gander. The term "goose" refers to both genders of various ages, and "geese" is the collective term.
Though multiple animals are called geese, there are other names for groups. A group of geese is called a flock or a gaggle. The group is called a skein but only if the animals are flying at that particular moment. If a skein is flying in a V-shape, it is referred to as a wedge.
Male and female geese build their nests and raise their young together. Goslings start to imitate adult behavior, especially flying, around 2-3 months of age.