Answer:
"Though the mammary glands of human males cannot produce milk automatically under natural conditions, with appropriate hormonal stimulus---mimicking that which human females produce naturally when they become pregnant and give birth---they can"

In summary, yes, it is possible, but not under normal natural circumstances.

- wikipedia

However, this is only or humans, several other males of mammalian species, can lactate, such as several bat species and goats.
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