Board Thread:Ninjago Wiki News/@comment-30938718-20190407142008/@comment-26537965-20190530120559

They are called the Sons of Gartmadon, because they are a cult that worships him. It has been explained in the show. Also, just because they are physically weak, it does not mean they are not a big threat. Their leader, Harumi, was a master manipulator and strategist.