Needs more Heal.
I was gonna leave it at that, but let me explain.
Poison's big benefit is that it happens turn after turn even after the creature has been removed/a shield has gone up. But if you die before Poison kills your opponent, you're dead and it doesn't matter.
For that reason, were it me, I'd focus a bit more on the Poison and run -2 Froggie +2 Heal. And add a Druid Staff ASAP.
Good luck!