I would say it all depended upon your primary vision of an ork, whether it were a Wh green skin, a D&D pigsnout (which were orangish), a mordor dark skinned creature, or a germanic folkloric monster that was more a twisted human cannibal than a different species.
I am sure that when humanity reaches far planets with strange lifeforms we will name these creatures based on what we already know. Bugs, birds, snakes, whatever these new beasties remind us of. So, if you want to call it an Orc, call it an Orc! (though I think you can do better than that!)
"I saw this in a cartoon once, but I'm pretty sure I can do it..."