After reading for a bit, it seems that we could add the HotPot module to the Moodle Mobile app, if we create a suitable add-on. For future reference, here are some of the relevant Moodle docs that exist:
- Moodle Mobile Plugins Development
- Setting up your development environment for Moodle Mobile 2
- Moodle Mobile Developing a plugin tutorial
- Moodle Mobile Developing a plugin tutorial part 2