AHH, YES. Deku Aen cannot neither open nor close his mouth. This means any food, deku nut or invasive slimy entity like the ChuChus can easily inflate poor powerless deku shark! D:

(Probably this is what the Clocktown guard meant with "It's too dangerous for a Deku scrub to go outside!"...)

Deku scrubs and ChuChus belong to Nintendo!