It is correct. It is one of those unusual nouns that does not have a singular form. Here are some examples: He gave a million thanks to his friend.
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ESLBeginnerBut I sometimesNo. To my ear it's not right unless you include an adjective, as illustrated above: a big thanks, a special thanks, a heartfelt thanks, etc. But I wouldn't go so far as to say that you'll never see it without an adjective.sawsee "a thanks"?isIs it right?