What page is the frog dissection on in book speak by Laurie Halse Anderson?

The frog dissection in Laurie Halse Anderson's "Speak" is not a literal event that occurs within the book.

The story is told from the perspective of Melinda Sordino, a high school freshman who is struggling to cope with the trauma of a sexual assault. While the book explores themes of silence, isolation, and the complexities of adolescence, it does not include any scenes of animal dissection.

It's possible you might be thinking of another book or a scene from a different work of fiction.