Tandaganon
https://en.wikipedia.org/wiki/Surigaonon_language
Tandaganon[3] (also called Tinandag, Naturalis, Tagon-on) is a closely related variety spoken in the central Surigao del Sur municipalities of Tandag City, San Miguel, Tago, Bayabas, Cagwait, Marihatag, San Agustin, and most of Lianga. It can be classified as a separate language or alternatively as a southern variety of Surigaonon. There are about 100,000 speakers. 
Surigaonon (also called Jaun-Jaun, Waya-Waya) itself on the other hand is the northern (Surigao del Norte) variety, with about 400,000 speakers. Surigaonon speakers are distributed throughout Surigao del Norte, northern Surigao del Sur, and northern Agusan del Norte.[4] Surigaonon and Tandaganon speakers can understand each other well, even if they use their own languages in conversation (similar to the mutual intelligibility between the Boholano dialect and the general Cebuano dialect). 
Together, Surigaonon and Tandaganon are spoken in Surigao del Norte and most parts of Surigao del Sur, except in the City of Bislig, municipalities of Barobo, Hinatuan, Lingig, and Tagbina. In the non-Surigaonons-speaking areas of Surigao, most of the inhabitants are descended from Cebuano-speaking migrants, and the rest are natives who speak Kamayo, a Mansakan language.