There two possible meaning of Facebook Emoticon Codes. It refer to Facebook Chat Emoticons or Facebook status Emoticons.
For Facebook Chat Emoticons Codes such as shark code (^^^) putnam face code :putnam: or Penguin, Smile and others you can find it the complete list of FB Chat Codes at here
If you means the Facebook Emoticons Codes that been used in Status Message, you can use Facebook Status Emoticons and Animation Application to make you able to create / make Emoticons on your Facebook Status. You can read how to use it at here.