Rigging a character

I can create human figures with ‘rigable’ skeleton, either on Makehuman as an app or Mixamo as online tool
Can I rig (move parts of the skeleton)

Is that a question? If you want to know if you can use an RIG from a other app in Nomad to pose the characters, then no.

Working on a rigging / animation app

Not animation but rigging. I’m still torn between apps I can use only on PC and those I can use on Android Tablet. I usually go out with tablet only.
I use Mixama to create animation and the extract the positions to manipulate on Nomad

It is an Android App.
See if that will do what you are looking for.