There are two kinds of Crows: small robotic drones that can fit in the palm of your hand, and Awoken fighters pilots and spies. Both are under the command of Uldren. The fireteam we know of so far is Kabr (lost to the Vault, remembered), Praedyth (trapped in Vault, forgotten), Pahanin (escaped Vault, killed by Yor), and Alemyr (fate unknown, forgotten)