This is the language that they use to communicate with other Badagas, but they are equally adept at speaking Tamil too and hence you might confuse them to be native Tamil people.
The Badagas speak a language called ‘Badaga’, which is primarily a dialect of Kannada spoken in a heavy Tamil accent. I have been told by Wing Commander B Jayaprakash, who himself blogs a lot about the Badaga community and their customs, that the above information is incorrect and that the Badagas are actually one of the original and native tribes of the Nilgiris. It is believed that the Badagas migrated from Mysore due to the threat from Tipu Sultan who used to rule during that time. These Badagas used to be locals of Mysore before they fled to the Nilgiris, especially the areas around Ooty, Coonoor and Kotagiri. The rest of the inhabitants of the Nilgiris are people who have migrated from Kerala and other parts of Tamil Nadu and the other local native tribes of the Nilgiris (Todas, Irulas, Kotas,Kurubas, etc.) who are a minority today in the Nilgiris. Most of the Nilgiri Mountains today are inhabited by the Badaga community.