There are seven gnome masks.
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Went to the location for the first time today, and no gnome to be seen anywhere. I decided to shoot a rocket at the house (blowing up the tractor as well), and then the gnome spawned and attacked me. Shot it, and got a gnome pod.
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It should be at the back of the house, behind the wood shack next to a rock. Screenshots of the place are above.
Btw.
Yesterday it was sunny ingame, there was just an apoc seeker nearby and I just got an advanced first aid kit.
Nevertheless, IF no machines are nearby (or already have been destroyed), but the gnome is there, my companion still warns me, that an enemy is nearby.
By this I know that it’s there even before I reach that place.
the explosion must have radiused the distance and hitting the gnome next to the wood shed, also respawn rate of that gnome is like 4 hours somthing, 
so if your someone that needs all 7 gnome mask, it’s will take very very long time
A night visit to the woodshed is the best time it seems. Got another tick pod yesterday.
I received a tick pod so it is there.