Jargon or cant.
A regional dialect of a language (especially French); usually considered substandard.
Jamaican Patois, a Jamaican creole language primarily based on English and African languages but also has influences from Spanish, Portuguese and Hindi.
Creole French in the Caribbean (especially in Dominica, St. Lucia, Trinidad and Tobago and Haiti).
Any of various French or Occitan dialects spoken in France.
A particular vernacular or vocabulary of slang; the jargon or lingo of a particular group.