The other day, I noticed that my bank was half filled with all types of tribbles. Is there a useful purpose for these things? I seem to get so many of them, and I can't help but wonder if there's some bigger purpose for them. Whenever I ask in game, I get really airy responses, indicating I don't think most people know the answer and are just speaking because they want to see themselves speaking.
To sum up: Is there an actual reason to keep these things, other than one or two you keep and just equip for heals (which I have yet to use one I've equipped because I heal really quickly after battle anyway).
If you cook them into food as mentioned above, and then feed that food to a tribble, the new one will be a cannibal that will then eat other tribbles. You can buy those cannibal tirbbles pretty cheap on the exchange. Having one in your inventory and bank can keep you from getting overrun if you want to keep them under control.
Just don't pet it - cannibal tribbles don't give you a buff, they bite.
Tribbles (and Tribble Corpses) can also be used in doff missions. You can use specific type to use in a doff mission to get another, more potent buffing tribble. You can also use their corpses (made by leaving a cannibal tribble with a regular or uncommon tribble) in Klingon bounty or cooking missions. The bounty missions are taken through the Klingon Security officers, and yield GPL.
Tribbles can also be used to make the special tribbles, such as the Cryo Tribble, Triolic Tribble, Winter Tribble, and Gamma Quadrent Tribble.
The Cryo Tribble grants you damage resistance and cold resistance, which is helpful against the Breen.
The Triolic Tribble gives you a slightly greater damage resistance buff.
The Winter Tribble grants an AoE buff (during the Winter Event) which makes you resistant to knock back, holds and cold damage.
The Gamma Quadrant Tribble helps you to see stealthed enemeies and boosts your damage against Jem'Hadar, Vorta and Founders.
Also if you want to keep a tribble, but don't want it eating any food in your inventory or bank space, you can place it in one of your bridge officer device slots. Your bridge officers will pet them and buff themselves out of combat if you bring them along on away missions.