https://www.polygon.com/2018/2/5/16974588/toad-mario-hat-or-head-marios-nipples-belly-button-super-mario-odyssey-nintendo

In a new video, Super Mario Odyssey producer Yoshiaki Koizumi addressed longstanding mysteries about Toad’s head, Mario’s belly button and the nature of Mario, Peach and Pauline’s relationship.

First, let’s address the all-important mystery of Toad’s head. Koizumi weighs in, definitively, on the oft-debated question: “Is Toad’s head a hat or a head?”