Yeah, with the 10 foot reach from the tongue and a racial wisdom bonus, they could be fun as a "bad touch" cleric, without having to tank on the front line quite as much as most. If I didn't already have a bad touch cleric in PFS, I'd probably go for that.
I really love the flavor of the Princely alternate racial trait. I'm just picturing this 2 foot tall frog walking around with a rapier and crown, charming people with his diplomacy skill. Given the dex bonus, maybe a swashbuckler or something, though that wastes the free rapier proficiency. The social skill bonuses are still cool, though.
Maybe a Princely divine caster (cleric, warpriest, inquisitor) with Weapon Finesse, to finesse the rapier and make use of the racial dex and wis bonuses.
The flavor of playing a humanoid frog is awesome - I just need to decide what to do with it mechanically.