Sure, but you'll need to install/activate the "Script Menu"...
Macintosh HD > Applications > AppleScript > Install Script Menu
You'll now notice the AppleScript menu item up in the Finder menu bar. From that menu, you'll want to navigate to the following:
Finder Scripts > "Add to File Names"
That script will execute to add any suffix/prefix to a folder of files, or individual files. Just make sure you have the folder open of the files you want to change at the time of executing the script.
Make sense?