A coyol, singular, comes from a palm tree, and quite possibly is just a baby coconut or palm tree seed.    From Wordnik.com.  [AntiguaDailyPhoto.Com] Reference

Sugar-cane, bananas, cocoanut-palms, plantains, and various other fruits are cultivated; vanilla, sarsaparilla, sapodilla or chewing-gum, rubber, and the cahoon or coyol palm, valuable for its oil, grow wild in large quantities.    From Wordnik.com.  [Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria"] Reference