The Collaborative International Dictionary of English v.0.48:

Foolahs \Foo"lahs`\, n. pl.; sing. Foolah. (Ethnol.)
   Same as Fulahs.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Fulahs \Fu"lahs`\, Foolahs \Foo"lahs`\, Fulani \Fu"la*ni\, n.
   pl.; sing. Fulah, Foolah. (Ethnol.)
   A peculiar African race of uncertain origin, but distinct
   from the negro tribes, inhabiting an extensive region of
   Western Soudan. Their color is brown or yellowish bronze.
   They are Mohammedans. Called also Fellatahs, Foulahs, and
   Fellani. Fulah and Fulani are also used adjectively; as,
   Fulah or Fulani empire, tribes, language.
   [1913 Webster]