Mesh Tools – Create polygons
Use this button to sew the corners of the mouth. I guess it is the Merge button.
This is the introduction to sculpting tools:
https://knowledge.autodesk.com/support/maya/learn-explore/caas/CloudHelp/cloudhelp/2020/ENU/Maya-Modeling/files/GUID-820F611F-3380-4D33-AC69-EEC62A59109B-htm.html
In Maya 2020 Grap tools icon changed to :
I think this effect is similar to Soft Selection.
Then I modified the wiring of the head and made the character’s hair and eyebrows.