Use this guide to help you find coding resources for a Chromebook!
Scratch Jr. is Scratch simplified for touchscreens.
Hopscotch is an app you can download for iPads to create games with a coding language in blocks.
Construct 3 is a game engine that will run on any device, including a tablet or phone!
You'll find tons more options in the code.org gallery - just look for the Android or iOS checkboxes on the left side.