Three of the four creatures seem unconcerned. The fourth creature is stunned and back on its heels due to Embla's last attack. It makes its dexterity check and takes no additional damage from being backed into the wall, following its being stunned. The other three frogs slash and horn at will.
The first, in 1010, was knocked by Lothar, but it rolls for a single claw. Lothar ducks the blow and it swings over his head. At once the frog retreats to 1109.
The frog in 1011 swings with a claw spins and attacks both Pandred and Embla. Pandred dodges the claw at her. Both of the other attacks are at Embla's flank. She feels a horn strike her in the side, causing an unpleasant 6 damage. That will stun, throwing her into 1210. The frog turns back to face Pandred.
The frog in 0811 chooses to completely ignore Lothar's back (rolled), choosing instead to focus on the cleric. Engelhart easily misses both claws: but the horn hits AC 6. That, I believe, is good enough [but correct me if I'm wrong]. It causes 1 damage: tit-for-tat.
Leaving this position:
Following the party's move, the layout looks like this:
And adding on the x.p. so far ~ please let me know if I've missed something: