@WOUNDEDWITCH @ArdainianRight The federal agent watching my account will do whatever he can (nothing) and I'll do whatever I can (say mean words at him on fedi at a time when people are bored and want to dogpile).

If you know either this guy or the kid in real life you can cobble up a more convincing tip to the FBI but as someone who has had similar experiences in real life I wouldn't expect much. Law enforcement for these sort of crimes is woefully understaffed due to a failure to pay people for the awful things they have to constantly look at. If you can literally tell the cops "this person with this name was doing this to this child here" then you'll do well, and it seems you have this guy's actual phone number so you might actually be able to do that.