It does not mention, but TinyCore comes with root user's password set to root.
Since one can simply sudo su as default user tc, it's really used or mentioned.
What happens however, that it can be overlooked at install time to change the root password (since there is nothing guiding the install process). This fact combined with the sshd_config default setting: #PermitRootLogin yes
can lead to disaster.
I suggest including change of root password in the install docs (I am not sure if it can be disabled with a "*" in /etc/shadow ??)