He's referred to as 'Graviton' in promotional material (http://abc.go.com/shows/marvels-agents-of-shield/video/most-recent/VDKA4462512). Does that count? If I remember correctly, that was the case for Rocket Raccoon.
Personally, I believe that is enough; Clark Gregg often added #Graviton under his tweets featuring Gravitonium-Talbot (https://twitter.com/TheCGReporter/status/992048122636455938); not to mention after he was infused with Gravitonium the camera shitfted to the container that distinctly showed "GRAVITON", and that shot was reused in the next episode's "previously-on-AOS" spot further signifying its importance.
Also in a Marvel.com article they referred to Talbot as Graviton. (https://news.marvel.com/tv/89006/marvels-agents-of-s-h-i-e-l-d-s-adrian-pasdar-on-the-one-who-will-save-us-all/)