I would go with nonsense poem.
Although poetry is not my area of expertise, I will do my best to help.
It is not a haiku, as they have 3 lines.
Neither is it a sonnet, as they have 14 lines.
A limerick usually has 4, but the first and last lines must rhyme, as should the third and fourth. This is not the case here, so this option is also invalid.
The remaining answer is a nonsense poem.
