What is an Ingress Grurf?
A green smurf (Grurf) is a an Enlightened Google Ingress player that abides by the game's Rules of Conducts and community guidelines though eliminates some key actions to give advantage to the Smurfs.
In short, there are three actions that Grurfs completely avoid, and it goes by their motto:
Never fire. Never mod. Never recharge
|Avoided Enlightened (Frog) Action||Resistance (Smurf) Advantage|
|Fire||By not firing on blue portals, the blue portals will remain strong until they decay or Enlightened team members attack them.|
|Mod||By not modding green portals, the smurfs will not encounter countermeasures in the forms of shields or torrents, allowing the smurfs to bring down green portals easier.|
|Recharge||By not recharging green portals (under attack or weakened through decay), the Resistance gets the clear advantage of unsupported / unprotected portals to go after.|
Now, why would anyone want to be a Grurf? I don't think there would be any reasons... don't do it, no one will like you (that is neither the Enlightened team or Resistance team would appreciate your actions).
Note: Same information applies to Blogs (blue frogs).