Distros specifically designed for children

Are there any Linux distros, other than Ubuntu, that are designed just for
children to use?

With the refusal of Ubuntu to allow one to run an account as full admin at
all times, it is known to be designed primarily to be safe for children to
use.

Are there any other Linux derivatives out there with these robust types
protections?  If a child knows how to type nautilus admin:/ into terminal,
they can bypass all of the protections for which Ubuntu was created.