Stop Motion Tools
Stop Motion Animator is a simple tool for creating stop motion animation sequences using a webcam. Change the speed of the animation, add audio, and save the sequences as a webm to Google Drive, and previously-saved videos can be loaded into the app and extended. Check out this example:
carol_of_the_lights.webm
https://app.cloudstopmotion.com/
Another alternative that lets you record, insert audio and text, and save as an MP4.
Google SSO
ClapMotion
ClapMotion is a stop-motion software that allows you to create your own animation by simply clapping your hands. It is an app available for free from the chrome web store App.
Google Slides can also be a fantastic option for creating Stop Motion Animations. Jake Miller has a great post about how to use Slides to create your own Stop Motion Animation. Here are some detailed instructions that will help your students. Check out this example.
Stop Motion Google Slides Tips and Tricks