Isn't bitcoin a token technically? It is a reward given to the miners for maintaining, inserting blocks into the blockchain. But we can use it as a currency because we can buy things and services thru it. So, it does not matter if they call it token or coin. It is still bitcoin to us.
From what I know, token is something you use to represent something else, and which would be used for you to redeem this something else.
Currency is something you use to exchange for anything else.