Not many Pied Noirs are muslims I would have thought
It all depends on definition I suppose.
Pied Noirs generally refers to the French colonialists who returned from Algeria after independence. But there were also a large number of Muslims who moved for (for their own safety) because they had fought for France in the war of independence.
The father of my Brother-in-Law's partner was in this category as he was in the French Army before independence.