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Can I say,

(a) They are window-shopping now.

(b) They like window-shopping every day.

(c) They go / go for window-shopping.
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(a) They are window-shopping now. Don't use the hyphen.

(b) They like window-shopping every day. I'd say "They like to window shop" but yours is not wrong. Don't use the hyphen.

(c) They go / go for window-shopping. Do not use "for." Don't use the hyphen.

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Please give me some comments, thanks!
 BarbaraPA's reply was promoted to an answer.