Basically all the RenPy games can be played on android, but the files have to be copied manually.
Random_Coffee: Sourceports are fun. You can play games like Broken Sword, Indiana Jones and Monkey Island with ScummVM on Android.
PixelBoy: You can, but it's no fun.
Maybe some game with a simple UI is playable, like Broken Sword, but I tried playing Zak McKracken during an intercontinental flight on Android phone, and it really got annoying very soon.
So while it's technically possible, which is nice, the gaming experience just doesn't translate to touchscreens.
Some play very well with the Android interface. Day of the Tentacle, Sam & Max, Full Throttle for example.
Monkey Island 3 ... not as good as I would hope, I don't like the the right mouse button emulation.
Loom, Indy 4, The Dig, Gabriel Knight and Touche work very well.
I think with Zak MacKracken you have the problem that it is one of the two games where you need to confirm each input choice.
Try the alternative input mode for the mouse pointer or just attach a mouse to your tablet and you are good with all of these games.
I think one of the key factors is speech. When playing on Android, I don't enjoy reading as much as I do on PC.
But damn ... the andoid version of Broken Sword 5 (I don't think it's available on GOG, got it through Humble back in the days) plays better than the PC version, that really hurts.