This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. someone who nibbles

n. a tool for cutting sheet metal

n. One who, or that which, nibbles.

n. One who nibbles; one who bites a little at a time.

n. A fish: same as chogset.

n. a biter who takes dainty repeated bites

"So it depends on what kind of nibbler you happen to be."

biter   

air bladder    millimite    food-quest    niggle    despatch-box    bornouse    amoebae    haik    Euphorbia    whatever-it-is