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I came across this, in Cuba in a backyard somebody who plant a mango and chirimoya tree close enough pick this odd fruit from the ground! http://www.cubadebate.cu/noticias/2016/08/17/cosechan-chirimango-en-camaguey/#.V7huMehYHMI
The inside of that fruit looks more like Mamey de Santo Domingo (Mammea Americana). Here is a video of a Mombin tree that produced Mango (in Spanish). https://www.youtube.com/watch?v=kpX-s1DwO_cRaul