Forum:Toon Monsters and Damage

I had a question about Toon monsters: If you control one or more toon monsters, can your opponenet declare attack on them, even if they have a stronger monster than yours? Or are they protected by Toon World or their toon class? Because toon monsters are labeled as being able to attack directly if the opponent does not have any toon monsters themselves, so in the other position, can you not declare attack on a toon monster? if you dont have any that is?