Maybe offer a webpage or version of the app tailored specifically to handle cases like these?
Maybe if there’s something that could do the heavy lifting of presenting the website to a group setting where there’s going to be tons of observations, teachers will spring for that versus something that involves a lot of their downtime being spent on trying to curate too many observations. It could be tailored towards advice like 'if you don’t know, use general suggestions like ‘plant’, ‘animal’, etc, as well as giving people an understanding of how the AI works, and to not treat it like a magic 8 ball.
The downsides I could see with this is 1. Making sure it’s available in several languages, 2. Yet another thing that needs to be synced up if something changes on iNat.