Oh yes, I was born in Sheppy so I grew up there and probably ate tons of wild food along the coast. My uncle said martingula. Even my cousin smiled because it was our childhood, we grew up together, picking nuts, berries and other fruits.I LOVE those! I used to live on the Natal North Coast as a school kid and ate them all the time! We used to call them Martingulas <sp> but I just did a google search and nothing came up. The common names are Natal plum, big num-num, Amatungulu! The scientific name is Carissa Macrocarpa.
I just realised I have been using the Zulu name for them and just pronouncing it slightly wrong! Amatungulu!