I highly recommend Termux on android. It really enables me when I'm on the go but need to SSH into work to run some quick scripts.
This picture shows me running Termux -> SSH to my laptop at home via OpenVPN -> SSH to work computer via OpenVPN -> Tmux running a Python shell writing/running functions on the fly for QA.
Termux (Terminal emulator with packages) - https://f-droid.org/app/com.termux
Linux Geeks doing what Linux Geeks do..