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The Agile Tongue feat just gives the Grippli another "limb/manipulator".
1. The tongue is not considered armed and cannot wield a weapon (it can pick up and hold items, not wield them). It is not a natural weapon and under the feat cannot be used to wield a weapon. Depending on what you use the tongue for, you would need the appropriate feat/ability to avoid an AOO when you use it. For example, Improved Unarmed Strike to do a melee touch attack, or Improved Disarm to do a Disarm combat maneuver. Note, if you are doing a melee touch attack with a spell, you are considered armed, so no AOO. The difficult question is if the opponent gets an AOO (and assuming they don't have a reach weapon or otherwise can reach your body), can they take the AOO against your tongue? I believe creatures with natural reach do not take AOO's if you cannot reach them, so an Ogre doing a disarm from 10 feet away against an opponent wielding a Longsword triggers an AOO, but does not actually take the AOO because the opponent cannot reach them (but I didn't double check this rule, so take it with a grain of salt).
2. If the rules allow you to grab the disarmed weapon, I believe the tongue could do so, but note that the tongue has a weight limit and while it can carry an item, it cannot wield it. I would allow a Grippli to grab a weapon with its tongue and return it to an unoccupied hand if it has one, though.
3. Holding a Dagger +4 does nothing for the tongue because to get the +4 from the weapon, you must wield it. The tongue cannot wield weapons.
Keep in mind that the GM can bend the rules in his game (subject to any social contract with the players). If the Gm wants to say an extraordinary Grippli has learned to use a magic dagger to aid it in disarm attempts, I'd probably let it go. I'd be focusing more on getting that dagger from its corpse (32,302 gp!). Ka-ching!