Arelith

Similar to bear but perhaps instead of +4 str/con they get +2 str, +4 con and a bullrush kind of ability when shifted similar to cavaliers. Boars tend to be very hearty animals that are quite territorial and will charge at those threats to themselves or their little groups. Thematically boars have also been an animal throughout many cultures that are viewed as magical in some way whether it is divine or otherwise so it may be fitting.

Oozes are naturally occurring in the underdark and part of the ecosystem fulfilling a similar role to carrion eaters of the surface. I'm unsure of what could be given to them but perhaps some minor damage resistances would be appropriate. Ooze would also give another option to more evil centered druids or druids of the underdark who tend the mushroom forests including but not limited to goblins

I'm honestly surprised this isn't already an option but Badger totem would be kind of neat for the more fuzzy animal type druids who don't want to be a bear or a wolf or rat. Badgers could also get something neat like maybe a little AC or reflexes making them quick little fuzzy menaces to local farmers or evil monsters.

Also a neat idea brought up by another player I know, Toads are a familiar type and would be very neat for a more swamp themed druid or tropical forest themed druid giving more options for surface druids who play more around the swamp regions of Arelith. This could also fit green hags who are druids though they are rare I would imagine.

Not sure if there are models for owls but an owl form would also be kind of neat for druids who work more during the dark of night. Owls are also incredibly stealthy birds so they could be a bird form with a bit more stealth than the others.