I would say NO on the swarm.
I looked up Sage Advice for 5e. They agree with the NO on swarms.
Quote:
Wild Shape lets you transform into a single beast. A swarm is a collection of beasts, not one.
https://www.sageadvice.eu/2016/03/01/ca ... m-of-bats/I also checked the wording in the Arcanis Campaign Setting Guide which says:
Quote:
When you join this path at 3rd level, you can use your bonus action to magically assume the shape of a beast that you have honored with your Honoring the Beast feature.
To me, this confirms the single beast restriction.