Not just this. A number of other languages also do exist here in Kerala. Languages being spoken by the people residing in tribal areas like Idamalakkudi, Muthanga etc are very strange. Thulu, Kongoni and Kannada are in use in Kasargode. When it comes to my district, Idukki, Tamil speaking people are the majority .

My native place is located in Tamilnadu. But I was born and brought up in Kerala.
ഇവിടുത്തെ തോട്ടം തൊഴിലാളികളിൽ ഭൂരിഭാഗവും ഏതാണ്ട് ഞങ്ങളെപ്പോലെത്തന്നെയാണ്. The strange language we speak is very much associated with the caste system being followed in Tamilnadu.

Watch this video where a Tamil school in Munnar is documented. Interestingly, the mother tongue of the anchor in this video is 'Tulu'. I bet not many so called malayalees can speak Malayalam as fluently as she does!