Are these on your own account or the children's accounts? If they are on
your own account, make your children their own user accounts and tell
them they are free to name the icons anything they want - My Poopoohead
if it makes them happy. Tell them if they change a single thing on
*your* account that will be the end of them being able to use the
computer. End of story. You are the parent, they are the children. They
have to do what you want since you own the computer and pay the bills.