What is the collective noun for gees?

There isn't a widely accepted collective noun specifically for geese.

However, here are some options you could use:

Formal:

* A flock of geese (most common and widely understood)

Informal:

* A gaggle of geese (often used to describe a noisy group of geese)

* A skein of geese (used when geese are flying in a V-formation)

* A team of geese (can be used if you're focusing on their cooperative behavior)

Ultimately, the best option depends on the context and your desired tone.