Why do we have a "tongue" if we have no way to modify it to make blend shapes?  no sliders, and no way that I can tell to modify the mesh or position.  Seriously!!  Can  someone please address this issue.  

I agree, it is kind of annoying that we can't do this out-of-the-box since the tongue is already a separate mesh. I did, however, figure out a way to do it and made a video about it. The only downside is that you will have to be at least a little comfortable with Blender or some other mesh editing software.



Cheers!

If you have CC3 Pipeline, it has some basic mesh editing tools that may be enough. Just make sure to use the soft-selection when selecting faces.
https://manual.reallusion.com/Character_Creator_3/ENU/3/Content/Character_Creator_3/3/08_Creating_Custom_Assets/Editing_Meshes.htm

I just uploaded this  Available from The Crank's Creations in Prop masters or my Store Agudo Animations.