Compatibility note: The current version of Tux Paint requires Android OS version 5 or later. Earlier versions of Tux Paint are available, which run on older versions of Android.
Tux Paint for Android (APK package)
Tux Paint 0.9.24
Date: May 30, 2020
From: Pere Pujal Carabantes & Jianwei Zhang
Tux Paint for Android (via F-Droid repository)
Tux Paint is available for Android devices in the F-Droid software repository ("app store"), a catalog of Free and Open Source Software. (You'll need to install F-Droid first.)