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Puffy Fluffy is a nudibranch and can transform into a vicious snake head fish/Dunkleosteus form. In each version, he is very different.
Big shiny light purple eyes
Cyan fins and tail
Pink and puffy lips
Light green body
Pink blushes on both cheeks
One small triangular tooth
Does not get along with other pets
Long, slender, and sluggy (round) light green body
Long, jagged teeth
Multiple tongues with mouths inside
Light blue giant fins and tail
Tongues tend to be sensitive to pain (as seen when Gary yanks the tongues)
SpongeBob buys him so that Gary would not be lonely while he is working at the Krusty Krab. SpongeBob fails to notice anything wrong with him, despite Gary acting very abnormal around him. SpongeBob blames Gary for everything he does, even when seeing him in monster form when Gary is wrapped up by his tongues and is almost eaten. Despite almost eating SpongeBob too, SpongeBob remains oblivious towards the situation. He ends up running away after Gary ties up his tongues together with a leash. SpongeBob blames Gary for making him run away.
Nudibranchs, which is what Puffy Fluffy is, are actually sea slugs.
His multiple tongues might be a reference to the Graboids from Tremors.
When getting Puffy Fluffy from the gypsy, she says something about it being dangerous. This is possibly a reference to the movie Gremlins, in which a man buys a strange pet from a Chinese shop owner, which refuses to sell it to the man because it is dangerous.
Nudibranchs appear as the main antagonists in the online game, "Gary's Revenge."
Puffy Fluffy's monstrous and vicious behavior was actually warned to SpongeBob by the gypsy selling the nudibranchs, but he completely ignored her and took one without even paying.
Puffy Fluffy tried to eat SpongeBob at one point, which is appropriate since real nudibranchs eat sponges.
Due to the vivid resemblance of Puffy Fluffy to mogwai (and gremlins), it was probably midnight or after midnight when he transformed (because of eating). This is the same case as the mogwai from Gremlins.
In Croatian dub, his name is "Čupavko" which means "Hairy."