Sure they can, they are invisible aren't they?
Seriously, prisoners escape all the time and they have no ninja skills so why couldn't a ninja?
An actual ninja from feudal Japan, yes they could.
A "ninja" from today who just took classes from one of the crap Bujinkan schools, no.
What is wrong with you people?
so i was thinking could a elite rank ninja the very best if they were given a task or test to see how good they are what are the chances of escaping from a modern jail no rude answers please