5) I think the idea of Grippli domesticating Carrion Crawlers is one of the coolest things in the world. Imagine the little frog people riding giant centipedes into war, and then hopping up into the trees and using poisonous darts against the archers while the crawlers paralyzed the front ranks of the enemy. Am I the only person who thinks that is worth basing a campaign around?
I think they'd make a nice campaign element, but not a campaign focus.
When I read this, I thought I could see the Grippli as horticulturists of some renown: keeping giant carniverous plants to protect their communities, raising exotic plants for powerful healing potions...or poisons. That kind of thing.
And they could use domesticated harvester ants to keep it all just so.