Playtone

Not unless you have Tom or Gary's email or one of their assistants' email addresses. Top level managers and agents do, and they have the ability to contact them. So if you have one of those, that's the way to go.
Playtone doesn't look at unsolicited material.
Tom Hanks is repped by Richard Lovett at CAA so you could email them/him if it's about something other than a script submission.