,just read on Wiki,that they are FAKE ,crab still have only 1 so far

oke have another question about al the different gnomes you come across,are the just decoration or do they have some value/purpose ?

There are 7 of these fake bobbleheads 1 for each of the SPECIAL tree, all not important apart from giving rude and sarcastic remarks.

As for the Gnomes, decoration or ammo for thw rock-it launcher (a custom weapon made via the schematics)