What is a male peafowl called?

Peahens, collectively they are called peafowl.
The species is called Peafowl. The male is the Peacock, the female is the Peahen, and the chick is the peachick.
Peafowl is the correct usage describing the birds in general

Peacock is the term for the male

Peahen is the term for the female

Pea chicks are the babies before identifying the gender

A group is called a bevy