To understand what a "focus poem" might be, we need more information. Could you please provide:
* Context: Where did you encounter this term? Was it in a book, a class, or online?
* Definition: Did you see a definition of what a focus poem is?
* Examples: Do you have any examples of poems that were called "focus poems"?
With more information, we can figure out exactly what a "focus poem" is and how it differs from other poetry forms.