I honestly thing that Tragonese would be more of an art form than a language... or could be both? There is certainly a oral aspect of it... a verbal one (ifyou aren't quiet in the bedroom), and there is the special types of dances that go along with it... so if Astrid knew Tragonese, would that be considered the art of draining tragons, or at least Hiccup's tragon? If so, what would the male counterpart be?
Interesting questions, o inquisitive Anon.
Yes, I do believe Tragonese would be more of an art form -- one that encompasses several lovemaking techniques, performed by a lover (regardless of gender) upon their male recipient. Such techniques include Tragon Whispering (AKA 'pillow talk'), moaning in a pleasurable fashion (regarding Astrid: she's far from the quiet type), expert hand-to-mouth coordination (literally) and a formidable set of hip movements (thrusting, rocking, swaying). All attention is, of course, focused on the male genitalia (the Tragons).
Astrid directs all of her Tragonese knowledge to one single lucky recipient: Hiccup.
As for the corresponding technique regarding the female genitalia: good question! Some brainstorming may be required. as I am feeling quite unimaginative... Clitorese? XD