I suspect not. You could try contacting the company but don't hold your breath. If the chat room originates and is hosted in the UK you might have some leverage by reminding them of their duty of care towards youngsters but otherwise in foreign parts rules are different or nonexistent to manage behaviour in chatrooms. On the other hand, it might be a good opportunity to have a talk with the little fellow about bad language along the lines of - this is what bad people say when they think they can't be told off - do you think it's right? And we won't use those words will we etc etc
He will inevitably encounter potty mouth online so helping him to see the perpetrators as losers rather than heroes will help him develop self-awareness and self discipline.
Worse than the foul language, these unmoderated chatrooms are visited by paedophiles looking to make contact with children, so helping the lad to keep anonymous, to cpome to you if something weird makes him feel uneasy etc will be another great support to his development.