On Chromebooks, like Android devices, you can download apps to your device via the Google Play Store. Here's everything you need to know to download apps on a Chromebook.

How to move apps to the card? After finishing that migration, which can take several minutes, you can transfer the applications to your SD card. This part of the process must be repeated for each app ...

But starting with the latest Chrome OS beta, it looks like Android apps on Chromebooks can access the SD card… although it seems like the feature is still very much a work in progress.