Coinz
Grouped by the Grunt most likely to acquire them ... acquired by Grunt #3
I (GooRoo) believe that Gaby intended each Grunt to 'clean out' the big pool of water nearest them.
As I (GooRoo) solved it, Grunt #2 acquired Grunt #3's pool Coinz.
The assumption is that the solver workz with a Grunt until he is 'stuck' before working with another Grunt.

No. X Y Description of where the object is found
1 10 51 In a Hole which becomez a Mound , which becomez an ordinary tile . (Most do this.)
2 12 51 In a Hole .
3 12 53 In a Hole .
4 10 53 In a Hole .
5 5 47 In a Hole .
6 29 46 In a Hole in the south central Gully.
7 24 52 In a Hole in the south central Gully.
8 29 18 In a Hole in the north central Gully.
9 29 12 On a Black One-Time Switch (BOTS) in the north central Gully pool.
(But Grunt #4 may get to it first.)
10 24 12 In a Hole in the north central Gully pool.