Can we report a fraudster by their bitcoin wallet address?
Nope, sorry, there's no way to do this.  The whole point of Bitcoin is it's censorship resistant, so there's no way to publicly blacklist addresses (although some exchanges have been known to spy on your incoming and outgoing transactions, such as Coinbase which have a TOS that prohibits it, and will threaten to close an account if you send transactions straight to/from a gambling site: https://www.coinbase.com/legal/user_agreement?locale=en).  

Plus the user is probably using a new address each time, since you can generate as many as you like there's no need to reuse it.