Summary

https://youtu.be/AS4HNdBJqNE
https://youtu.be/O_2uzSxzXOg
A mechanisme to move a head. Push YES or NO.
Put any (doll) head on top of it.
As an example I took Loubie's pumpkin, scale 1:1.
https://www.thingiverse.com/thing:505152
The three parts are combined in one print.
The "yes" piece is improved and separately attached.
Another head might be familiar to you:
https://www.thingiverse.com/thing:2476372
Ask a question and let him answer.
https://youtu.be/gmwg2HL7PbE