They do migrate, so you are good in that category, and taste much better than waterfowl. Plus a lot less equipment.[] Boats and canoes are frequently used to hunt them, and they are damn good swimmers.
I see something like this, and all I can think is HOW BIG WOULD A BROOK TROUT NEED TO BE TO EAT THAT? And COULD I CAST A SQUIRREL FLY ON A 6 WEIGHT?
In all seriousness, I heard two reports this fall of striped bass hitting squirrels migrating across the Kennebec River to reach an island with a big stand of oaks.