Blabberize allows you to take a snapshot, outline a mouth, and then record text. The mouth moves in conjunction with the text.
It sets up very quickly, and is a great way to get students into the writing or speaking process.
In order to make a video you will need to make a free account. Then you will be able to start a video.
I could not leave well enough alone, with just a moving mouth, for some reason I felt compelled to make my eye twitch...