There are two answers for this, a low-tech way, and a high-tech way.
The high tech way is the Tudor Games App, which lets you type in the team names and use logos.
The low tech way involves using Post-It Notes. No tabs needed, stick them on as needed, and then take them off when you're done.
If you're feeling fancy, print out small logos on regular paper, and use a little piece of double-sided tape to place them on the scoreboard. Be gentle when you peel them off, and there shouldn't be any tearing.