Bulbul sent me a link I just had to post about: the article describes, among other things, a secret language used by the Gnaoua, descendants of West Africans brought to Morocco as slaves in precolonial times, in El Jadida, Morocco (on the Atlantic coast.) The author makes no attempt to seek an etymology for the words recorded, but a lot of them are immediately obvious to me - as Songhay. Thus:
* sindi "sommeil": Songhay cindi "rest"
* kuy barkuy "on s'en va": Songhay koy "person", koy "go"
* katihari "...apporter de l'eau": Songhay kati hari "bring water!"
* noro "money": Songhay nooru
* dangi bamatcin "tais-toi": Songhay dangey "be silent", ciine "speak"
Significantly, these words do not display any characteristics that would link them with Kwarandzie. To the contrary - noro and hari are unambiguously Southern, not Northern, Songhay in form, and most of the other words haven't survived in Kwarandzie.
A few words are clearly non-Songhay, and as such harder for me to identify, but these include some Bambara words:
* sgho "viande" - Bambara sogo
* dominika "nourriture" - Bambara dumuni ke
Elsewhere, I've read of Hausa words showing up in Moroccan Gnaoua music (I don't have the reference handy here in Tabelbala). The various sources of the vocabulary attest to the wide geographical range from which slaves were brought, and it's interesting that the words were preserved at all. I look forward to finding out where the other words come from... any ideas?