I brought some pond plants inside to start my planted aquarium. They're
starting to look pretty good, but I've just started to notice some critters
on the Hornwort. This will eventually be a community tank and GF vegetable
farm. So I have to kill off all the critters.

They are small brown balls (sort of curled up) where the leaves of the plant
meet the stem of the plant. What are these, snails?

Pinging the Snail Queen!

TIA