A "poet friend" refers to a person who is both a poet and a friend. It means someone who writes poetry and is also someone you have a close and supportive relationship with. Full definition
That letter, as well as other correspondence and collaborations with poet friends, is now also on display at the Poetry Foundation. (art.newcity.com)
She loved poetry and had many poet friends. (artsjournal.com)
I also began to do a lot of writing — prose and poetry — and I entered into heavy correspondence with my New York poet friends — Ron Padgett, Kenneth Koch, Ted Berrigan, David Shapiro. (artnews.com)