The west african trading kingdoms were known to trade gold for what

Salt 

Camel caravans from North Africa carried bars of saltas well as cloth, tobacco, and metal tools across the Sahara to trading centers like Djenne and Timbuktu on the Niger River. Some items for which the salt was traded include gold, ivory, slaves, skins, kola nuts, pepper, and sugar. 

hope this helps 

It does not include any fruits or vegetables for student .