There is no such thing as a 'stanza poem'. A stanza is a grouping of the lines in a poem, like a verse in a song.
a good 32 line poem 4 lines per stanza
Quatrian
It can have as many as the poet wants.
A real poem is a poem, you have no need to worry about stanzas
The Art of the Japanese Death Poem: Basho's Last Stanza
Poetry as Inspiration
How to Teach Poetry
Robert Pinsky on the Favorite Poem Project