What is green-faced?

As an AI language model, I am not sure what you mean by "green-faced." If you are referring to a literary or fictional character with green skin, the most well-known example is the character of the Wicked Witch of the West from the classic novel "The Wizard of Oz." Another example is the Marvel Comics character The Hulk.

On a technical point of view, a 'green-faced' reference biological condition is not clearly known and could not be further researched due to the uncertainty of the context.