Not quite a mango, but when transferring a pitangatuba sprout to a bigger pot, I noticed two tap roots coming out of the seed and the start of the second sprout. Way too difficult to separate, so for now they grow together:
Back to polyembryonic mangoes . . .
I got three sprouts out of a NDM seed. When I went to separate them, discovered these two were connected to the same single tap root:
Together they shall grow.