Answer:
A poem indeed can have an AABB rhyme scheme, there is no rules to rhyming poems (except that it needs to rhyme with a flow). Yes a 3 stanza poem can have an AABB rhyme scheme for example...
Twinkle twinkle little star
How I wonder what you are
Up above the world so high
Like a diamond in the sky
--
Upon a nice mid-spring day
Let's take a look at Nature's way
Breathe the scent of nice fresh air
Feel the breeze within your hair
Explanation:
