How can there be waves in the ocean?

I have a few questions about the flat Earth society.

Waves are created by the movement of the plates of the Earth.
In the flat Earth theory, how can there be waves?

Also minor questions. Penguins live on the south pole, if according to the flat Earth theory, the poles are a big wall around the edge. Where do penguins, polar bears and animals alike come from?

I have a few questions about the flat Earth society.

Waves are created by the movement of the plates of the Earth.

No.  The vast majority of waves are created by wind.