Yes, but only in the "Homework" mode. If students use the exact same name to join a game, they will be allowed to resume their incomplete game.
So when a student wants to stop playing, they can click on the "X" at the top right to exit. Then whenever they want to resume, just enter the same game code and name, and they'll be able to resume where they left off!
Keyword: Can I resume an incomplete game, I want to finish my homework game, I want to edit my answers for my assignment, Can I resume playing with a different name as a student