I Googled portmanteau, to ensure my full understanding of the term, and clicked on images, finding this very picture in the first few images available. Interesting... I then looked further into the term and found that Lewis Caroll, the creator of Humpty Dumpty, had also been the pioneer of the portmanteau with words such as "slithy", which is a combination of lithe and slimy. Now I think I understand why Humpty Dumpty is such a prominent figure in FW.