Even if he doesn't, he can take a guess at what they are. Funnily enough, there is a cicada Pokemon: Nincada and its evolutions, Ninjask and Shedinja, so if anything he'll think of something similar to those.

At his question, though, he shakes his head.

"Sorry, I only have Dragonite with me right now. I'm not sure if the other trainers have any bugs with them, either." He knows it's disappointing, so.... "I could draw a few for you if you like, show you what they look like?"