I always enjoy recognizing a specific developer's handwriting in a finished product. Luckily, Valve's misyltoad, a proud inhabitant of "Frog Cult", United Kingdom, makes this very easy. From their work on frog-fifo-v1 for Mesa, to frog-color-management-v1 and frog protocols for Wayland, to their talk Rainbow Frogs: HDR + Color Management in Gamescope/SteamOS, they seem to follow a very strong theme. I'd be surprised if they weren’t responsible for this frog as well.