Hi and Welcome to UKLDF.
In regards to Silicone doll heads that allow oral, I was just about to write how things had changed recently with manufacturers, many now offer soft heads and some with real oral structure. I could not remember which offered ROS, then I found this.
https://siliconelovers.com/blogs/rea...e?currency=GBP.
Jiushen Doll also offer a few soft silicone heads with movable jaw and oral option.