Tagdal (Suna da Abzinanci: Tagdalt) Harshe ne mai hadin hadaka da harsunan arewacin Songhay na tsakiyar Jamhuriyar Nijar. Wasu masanan harsuna na kallon harshen a matsayin hade-haden harshen Abzinanci, yayin da wasu masanan ke kallon harshen a matsayin harshen arewacin Songhay. Rabin kalmomin sa aro ne daga harahen Abzinanci. Akwai rabuwar furuci biyu daga harshen na Tagdal, Akwai wanda mutanen "Igdalawa" ke yinsa, da kuma makiyaya mazauna a gabashi bakin iyakar Nijar ta yankin Tahoua, da mum Tabarog, wanda mutanen Iberogan mazauna tsaunukan Azawagh iyaka da kasar Mali ke yinsa.Tabarog. Nicolaï (1981) yayi amfani da kalmar Tihishit a matsayin bangon bayan littafin sa maisuna Rueck & Christiansen yace ...mutanen Igdalen da na Iberogan suna da kamaceceniya da juna, kuma yanayin furucin su yayi matukar kama. Nicolaï na furka "tihishit" wadda itace ta kurkusa da misalan furucin... duk da haka wannan kalmar tayi harshen damo. "Tihishit" bangare ne mai asali da Tamajaq ma'ana "harshen bakake". Mutanen Igdalen da Iberogan na amfani da wannan domin danganta ta ga dukkan harsunan arewacin Songhay.