"Nnnnnot anymore... " he replies, back to uncertainty.

"Sorry, I'm a little new to Miliways. We don't have plant dudes where I'm from."

Unless... someone happened to be hanging out in a marsh or something when the Particle Accelerator exploded, combining their DNA with leafy greens. Or the Central City Botanical Gardens!

"There could totally be a Mossy Avenger out there... "

Please excuse Cisco and his faraway expression and voice, he's contemplating metahuman possibilities in his head.