My 3rd level party was almost wiped by a single frog with just 12 hit points. The frog gave me just 1 xp, meaning I was probably missing some strategy here. And, it jumps around a lot. You can find this frog in the Putrid Bog area. It has some reflective effect on it that makes all your projectiles go back to the caster/shooter. And it has some pretty bad ass AC, making most melee hits miss. I ended up with rogue and fighter mirroring frog's jumps under jump spell and cleric reviving my mage every turn because the frog decided to go for the mage with its attacks. What did I miss here? lae'zel finally landed a hit, but it was like turn 5.
Hmmm... I met it..had speak with animals on, and it was listed as "confused Frog" and I was friendly to it, and it went on it's merry way.
Of course I also had "speak with animals" on when meeting "the sheep" and we decided to just treat them as sheep and we all ignore each other...seems to work out fine.