That's a whip and tongue graft but without the tongue, it's the most common graft for cherimoyas in Spanish nurseries, I tried once on mango and it took. Some people say it's less traumatic for the tree than the cleft graft. Truth is that I do both every year on stone fruit, figs, Annona or mulberries and in the mid term I never noticed a difference. They both heal fine for me and hold well in my windy area.
