I like that it sounds like gargling. It's just a funny image.
Like, we're on our elfcation (version two maybe), and one of the dragon princes starts being a dick to our elf friends. And they're snobbing/stoicing at each other. Mathilde meanwhile goes to the dragon and starts gargling at it. After a minute (it was some intense snobbing/stoicing) the others notice the ongoing conversation. The shadow elfs are like 'WTF?'. The dragon elf is also like 'WTF?', except more arrogant, and then also starts gargling.
And so you have Mathilde, Dragon Elf and Dragon just gargling away. And I can't (and don't want to) shake the mental image of them standing their with their mouth wide open and head tipped back, like you'd do it when gargling water.
Gargling.