I'm pretty sure there is no secret item otherwise i would know.
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No but there are secret rooms such as the HQ, ninja hideout, and captains quarters.
To get to the secret dojo, you have to be a black belt, challenge sensei (beat him), and you will become a ninja. Once you beat him he will give you a ninja mask and tell you where the secret dojo is.
Onceyou beat sensei click on the stone door outside.The Club Penguin Ninja Hideout is next to the outside dojo door. It is that rectangle stone with carvings on it.
You rank up to the black belt and then you verse Sensei. If you win against Sensei you become a ninja! And then you Go to the dojo courtyard and waddle your penguin to the left and click on the door and your penguin will waddle to the secret room! Tada!
there is no ninja hideout in club penguin 2013