Yes, some plugs I got off Amazon were fakes. Real expensive $14+ a plug NGK iridium EIX type motorcycle plugs. Of course I didn't realize it until it fouled out waaaay before it should have. I'll never buy plugs online again, unless from a genuine auto parts dealer. Even then I don't know.
I have a set of "KKK" branded plugs that came with a carb tune up kit for a Harley. Chromed on the electrode and the threads. Good for lol's