I think that is spoken in Tohoku area.
But "Gonnichiwa" is not used even in Tohoku because this dialect is used when it is not initial letter.
Also sometime たちつてと (ta-chi-tsu-te-to) change to だぢづでど(da-ji-dzu-de-do).
行く（iku） → 行ぐ（igu）
書く（kaku） → 書ぐ（kagu）
おとこ（otoko） → おどご（odogo）
note; Generally these usages are not used in writing.
FYI;Life in the village of Inakadate