"Freeze it! Cryogenic Freeze Arrow's at your service!"
The cryogenic freeze arrows were one of a variety of trick arrows that contained a cryogen formula that was released and froze anything upon impact commonly used mostly by Green Arrow's sidekick Speedy. First seen in the episode Sidekicks Assemble, Speedy uses some on several of Ra's Al Ghul's henchmen. Later, inside the Flying Island, when Aqualad suggest short circuiting the firing mechanism Speedy says that freezing the machine would have the desired effect provides the arrows.