There are a few fruits which are found to have been high in protein. A cup of passion fruit contains 5.2 grams. One pomegranate contains 4.7 grams of protein. One avocado has 4 grams of protein. A slice of jackfruit has 2.8 grams of protein. A cup of mulberries and blackberries both contains 2 grams of protein.
Using the given information, it is truly hard to give an exact answer as to what fruits are high in protein since a cup of one fruit is different from a cup of another. However, aside from the abovementioned fruits, guavas, kumquats, apricot, currants, starfruits, raspberries, kiwi, nectarines, cherries, bananas, cantaloupe, watermelon and honeydew lemons are all considered to be high in protein, as well.