Pocket Paint app
Pocket Paint is Graphics application that is open source under the AGPL-3.0-or-later license. Paintroid is a graphical paint editor App, that, among others, allowssetting parts of pictures to transparent, insert Text / Images, add Layers,
use Color filling and picking tools, rotate, resize and position
elements...
It is also known as Pocket Paint, it is associated to Catroid (which is
like Scratch but for Android).