They have not been explained deeply yet, though given their name it may be ascertained that they have long necks.
Totto Land is a location in the New World where members of all races from around the world are welcomed and can live in harmony with other races, so it is likely snakeneck tribesmen are welcomed there as well, although it is unknown if any actually reside there.
- ↑ 1.0 1.1 One Piece Manga and Anime — Vol. 51 Chapter 501 and Episode 395, The Snakeneck Tribe are shown on the list of slaves.
- ↑ One Piece Manga — Vol. 82 Chapter 827 (p. 5).