If you want to lean a programming language i would recommend Gamemaker studio 1 or 2, there is also a drag and drop feature available in this as well. It's in my opinion the best engine for new beginners, that's how i started.
I'd say there's practically no game engine you can learn in an hour. However I'd recommend checking out Godot or Pygame. Pygame uses Python and Godot uses GDScript which is based on Python. So instead of trying to cram for this jam, try learning one of the suggestions in this thread for one or two weeks and join the next available Mini Jam then.