Former WWE Wrestler Kenn Doane -- Slams Bullies With First Children's Book

Pro wrestler Kenn Doane knows a lot about being a bully -- he played one as a former WWE star -- and now he's using that experience to write his first book ... about kids and bullying.

Doane -- known as Kenny Dykstra in his WWE days -- tells TMZ, he decided to become an author while rehabbing a knee injury suffered last month ... and wanted to address the topic of bullying.

The former tag team champ must be a badass with the pen ... because he's already lined up a publisher for "Billy's Bully" -- which shows one kid standing up to his tormentor, and teaches kids how to avoid becoming a bully.

According to Doane, his publisher hooked him up with illustrators and another author to put the finishing touches on the book -- and it should be released sometime in June.