It's not even a book who's what.  It's about teaching the facts to children.

Sad that even adults misinterpret because they are so saturated with nonsense they cannot recognize truth when they read it, so they make stuff up.  Good grief.  Amazon miscategorized it, as far as I'm concerned.

https://www.dailywire.com/news/activists-demand-matt-walshs-johnny-the-walrus-be-removed-as-amazons-top-lgbtq-book?itm_source=parsely-api&utm_source=cnemail&utm_medium=email

QUOTE FROM THE ARTICLE:

"The mother in the story “starts to learn … just because your child is pretending to be something, doesn’t mean he actually is that.”

Not only is your child not a walrus because he says he is, Walsh said, “the book might also draw other comparisons, like maybe if a young boy says that he’s a girl, it doesn’t mean that he actually is a girl.” "