This is free, switch accessible program from Inclusive Technology.
Record your voice and hear it played back while a face animates!
Whilst this has been done before in other contexts, they have made this stand-alone program freely available with the following features:
Choose from seven faces:
•Alien
•Female
•Male
•Robot
•Simple
•Clown
•Santa Claus
Click on the website link and scroll down to the 'Talking faces' section.