Chompers & Scorch
Although the dragons apparently spoke Draconic, Johann VonGruppen took it upon himself to teach them common. He decided his quest was complete upon managing to get the two dragons to shout the word "Fuck!" whenever a specific hand signal was given.
The two have taken to using the term in a variety of different situations, conveying emotions ranging from despondent to frightened to elated. It's amazing what one can accomplish with this single syllable.