Gorgons and Images

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I was told or I read somewhere that there were five gorgons?

Is this true and if so who were they. I know of Medusa but the others I am not sure of.

There were also satyrs. Does anyone know them or have a list of them.

I saw a photo of one of Sertorius Festus phalerae. One of the images (his lower left phalera next to the horse) is a round chubby face. It appears to have no facial hair and looks rather like a boy instead of a man. Does anyone know who might this image be of.

Thanks

Paolo