(Aug. 2022)
The first creature is a regular big snail but infested with green-banded broodsac worms. I think I did it in a kind of boring way, gonna redesign it later.

The second one is a large hammerhead worm that preys on snails and hides in their empty shells.

The third one is a bite mite, the most common non-sapient arthropod in Favon (only insects are people in this setting arachnids are animals). It's a basic omnivore that can swarm.