This is a Baby Baron monster that's blocking the entrance to a hedge maze.
<Speaker>!: SFX1 - check on screen.<end>
Have not encountered this.
//<Speaker>「べろべろ ばあ けけけけ<line>
<Speaker>!: SFX2 - check on screen.<end>
Not sure what's going on with this one. There doesn't seem to be anything in the text that might be a follow-up. I've had full health when I've talked to the guy, and at this point in the game you don't have any party members that use SP (which, I'm assuming, is the game's equivalent of MP.)
*: I'll teach you something nice!<line>
But first, stamina!<line>
Replenish your stamina!<end>