I hope like heck that is not what someone sold you as a GG, because it isn't our fish. I would have to actually have few samples in hand with a microscope, but at first glance I would guess a green or red crossed with ?a longear or redear?. Not certain of the true Blue factor yet. A dozen people will give you a dozen answers when it comes to hybrids because of the whole gene dominance thing, especially when they "just glance" as mentioned above. Pictures can often times be deceiving to the naked eye. This one is a juvenile, which make true traits less easy to mark. Got anymore pics without the trash around his mouth area? Any others similar in size and traits?
Deb