What is called a group of geese?

Answer 1

A group of geese is commonly know as a gaggle ( example: the gaggle of geese swam through the pond)

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On the ground, a gaggle. In flight, a skein. But the term flock is used for many types of birds.

Answer 2

A group of geese is called a gaggle of geese, a flock of geese, or a skein of geese (in flight).
a gaggle of geese

Answer 3

flock or gaggle