Club Penguin now has an official French Twitter account! So far it seems Loustik005, a French Club Penguin Team Blogger, is the one who is tweeting. Here is the profile:
The Twitter username is ClubPenguinFR. You can go to twitter.com/ClubPenguinFR to follow the account if you are a Twitter user.
It is also possible that @ClubPenguinPT and @ClubPenguinES are owned by Club Penguin as Polo Field, a Club Penguin staff member, is following them on Twitter.