A quick google shows that Chicaloca is a fashion slash art brand thing in Korea. You can see some of their stuff at
http://chicaloca.com/ The Action Doll and Chicaloca is MSD size. And Yomi and Berry have the same body, their head sizes are just a half size different it seems.
Unless you meant the Action Doll, which has a few more parts in the legs, one part which allows the leg to twist sideways, and another part inside that can hold the leg thigh, allowing the knee to reach the chest. I'll have to take pictures. The leg string seems a bit too tight for me to do that easily, but yeah.
Edit:
This is my Hujoo Dana, Kelly, sitting how she normally does. She doesn't even need to be against anything, she just sits.
This is the inner joint thing I was mentioning, it shows if you pull the leg apart.
This is the Action Doll sitting with that leg in that part.
It gives the body an extra point to bend at, allowing a pose that a good chunk of dolls can't do. I don't use it much, because her bloomers get in the way.