patois

A regional dialect of a language (especially French); usually considered substandard.

Any of various French or Occitan dialects spoken in France.

Creole French in the Caribbean (especially in Dominica, St. Lucia, Trinidad and Tobago and Haiti).

(Jamaica) Jamaican Patois, a Jamaican creole language primarily based on English and African languages but also has influences from Spanish, Portuguese and Hindi.

Jargon or cant.