Are there any quatrains in this poem? My research states that there is six but I don’t think I understand it enough to point them out.
Yes, like many other poems of Blake, this one also contains rhyming quatrains of anapestic and iambic tetrameter. In fact, a quatrain is the stanza with four lines and here the poet has divided entire poem into six stanzas and each stanza consists of a quatrain, meaning four lines in each stanza. This adds a good symmetry. Besides, the first and last two lines in each stanza rhyme, which is called a couplet.
I hope you would not have confusion about quatrains now.