We moved to a new house in Northern California and have two trees sprouting mystery fruits. Both trees have fruits that are about the size of a cherry and light green in color. One of the trees, the fruit is hard and a handful on the tree have red coloring, but mainly they fall to the ground green. The other tree has fruits that at first glance seem the same but are much softer, almost the texture of a plum. they seemed to all be light green. Much to the horror of my husband I tried the soft one and it tasted plum like but maybe because I was thinking about plums. Any clues to what these fruits are? Thanks!!