Not really but it's mentioned a few times. As someone with pretty severe emetophobia none of these triggered me but I'll list them anyway
At the start of the book one of the kits described the yellow stench as smelling like shrew barf. Also near the beginning when one of the kits is trying to escape form the rabid teacher he has to squeeze into a tiny mole hole and almost gets sick from the pressure on his stomach but doesn't. I don't remember when but Mia catches a swamp creature (idk what it's supposed to be) for her and uly to eat and uly gags because it's tasted slimy and disgusting.