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foogol friends
I think that each game's 3 main puppets are represtive of the 3 foogol friends from a certain time. SMS 2's are the original puppets but in a twisted form bc of nightmare (the foogol friends "villian"). Now the normal forms were probably creepy which caused a redesign. In SMS 1 we see the new versons of the characters that were probably also twisted by him. The 3rd game we know almost nothing about but maybe in the show he maded twisted forms of them but this is likely falce. Please put your thoughts in the comments