The Hydroponic Division was originally conceived to adapt Terran plants to the anticipated environment of Proxima Centauri. Extensive gene-editing was employed to develop resistance to alien fungi and pests, and accelerated adaptation hacked into the plants' genetic code.
Like many other critical systems, Hydroponics was abandoned during the Mutiny. The carefully cultivated flora and fauna was left on its own in harsh environs designed to propagate rapid and brutal evolutionary cycles. When men returned to reclaim Hydroponics, they discovered an environment as wild and hostile as any Earth jungle...
Frogs are already used in agriculture as a form of biological pest control as they have a healthy appetite for insects and are highly resistant to insecticide. Plus they have a wide range of natural abilities: jumping, toxic venom, hallucinogen, even retractable spikes (the wolverine frog), which would make them a top choice when it comes to cost-effective terraforming.
The frog is a 'hard to hit, easy to kill' critter (high evasion due to the small size and mobility, low hit points and no damage resistance). They will attack in packs and come in 3 varieties: bullfrog (leg biter that will go for the throat when a character is knocked down or down on one knee), poison spitter, and psyker (fucks with your head from a comfortable distance). It's a low level critter that prefers easy prey (i.e. low level, poorly equipped parties). They aren't very aggressive and won't attack unless threatened. When you run into them for the first time, they'll be busy feasting on a corpse. If you want to go through that corpse's pockets, you'll have to kill the frogs first.
That's all for now. Merry Christmas and a Happy New Year to you and your families!