Tulu Nad 

Sir, Tulu nadu was a part of Kerala which stretched for Kanyakumary to Gokarna. Ofcourse Im not speaking about the present Kearala state. Kanyakumari is in Tamilnad and Gokarna is in Karnataka today. I'm speaking about the Kerala mentioned in many Purana's as "Parasurama Kshetra." Though it is mythology there is fossil evidence to prove that this land is formed at the same time.

One more thing is Tulu and Malayalam have same script. please refer the site http://en.wikipedia.org/wiki/History_of_Kerala.