Looking for a specific funny adjective
How do you call someone who is always looking for something to eat like chocolates, sweets, ice creams in a funny way to tease them for example. He/she is not necessarily fat. The only word I found via dictionary is chubby? Does that make sense? Thank you.

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You might say they are a bottomless pit, if you want to say their appetite is never satisfied. I don't know if we have a word In English to exactly mean what you are asking about.

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Chubby means fat. You mean the person has a "sweet tooth".

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A sugar magnet?

(This isn't a real expression though.   "Sweet tooth" is indeed the traditional term)