Fun & Games / Fun with Sea Shells / Bouncing Beach Surprise / 2 Roos Female kangaroos are called does, flyers or jills. Young kangaroos are called joeys. Males are called bucks, jacks or boomers. A group is called a mob, troop or court. Roos by the beach | 2 Roos | Mum and Joey | 4 Roos © 2009, Jerry Jindrich. All rights reserved.