Sharik al-Nakha'i (may Allah have mercy on him) narrates from Suhayl (may Allah have mercy on him) with an addition in it: Muzabanah is that you sell the fresh fruit of the date palm for dried dates, and muhaqalah is that you sell wheat lying in the ears for wheat.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10645