[US]I managed to identify my dads scammer is there any way I can report him? (hasn’t actually scammed my dad yet)

A user discovered their father was engaged in a potential romance scam via Telegram with a person named 'Kate' from the UK. The user blocked the contact, identified the scammer's Nigerian phone number, and used OSINT tools to link it to a Facebook profile, but is unsure if they can report the scam since no funds were lost yet.