@Doomslug Doomslug Doomslug That is almost certainly a Tamu Kek per Dragonsteel Prime's description and WoB numbers 16187 and 14645 confirming that the Dragonsteel Prime Tamu Kek is, indeed, still canon.
But yes, the Tamu Kek allowed (allows) communication with dragons.
For (a little bit) more information, there's a (short) coppermind article on them: Tamu Kek on the Coppermind