Yes, this is related to CLAM coin.
CLAM coin is an altcoin that was distributed by whether you were holding BTC, LTC, or DOGE, in a address on a certain date.
If you do, that address can be "harvested" or "dug" as they call it, to get the CLAM coins.
So what the hell is this "clam coin". I have never heard of it. Could you please explain for the people that haven't been into Bitcoin for a long time.