[kunitokotachi]

No, datte bayo or bayo is not real Japanese. The anime creator created a "Naruto 弁" or Naruto's own way of speaking. There is no 方言(dialect) known that speaks like that. Using this expression will cause someone to be laughed at.
いいんだってばよ
全然ねってばよ
Nobody speaks like this. Many words that appear in comic books are not words really used.