Mudskip Bog is the fifth area encountered in Steak and Jake. There is your first one of the Timer Bomb Challenges here called Beware the Timer Bomb. Is it a mud?
Looks like my Pastaria server wants to defeat baddies in the Stone Mesa, and the Mudskip Bog!
It, and every other arena
Local Baddie: Bogbagger
The 5th area, Mudskip Bog.
Challenge: Beware the Timer Bomb
Milk Race: Mudskip Race