[Tola]

That's of much vintage and I remember it as Ninja Turtles, whatever it aired as at the time.  Perhaps ot was rerun under the original name.    Struggle to see how they had an issue with the word Ninja.

AFAIK, it was for having strong negative connotations with "assassin" (which is what the word ninja means after all), and it was thought that it would've been too violent for children at the time, hence why in the UK, the original show was heavily edited to remove the word and certain weapons associated with it.

While looking it up, I found an article for the issue here:
tribunemag.co.uk