Here’s the Korean for gookhwabang 국화빵
Japanese make something very similar, imagawayaki. Mitsuru Cafe makes them fresh and is pretty good. It’s been a number of years since I’ve gone, I don’t know if they do it all the time or only on weekends.
In Taiwan it’s called 紅豆餅, I usually only have it now when my parents go to some gathering at a community center. On weekends there is sometimes a lady who makes it inside 99 Ranch of these other Asian supermarkets. A search online yielded a directory, maybe you can try some of those: https://www.ccyp.com/subject_sca_area/tag/紅豆餅
In Torrance, there’s a Korean place Okrumong that serves the pastry shaped like fish and a baked one but these all taste fairly similar. I’ve never been myself though.
And lastly in the refrigerated section at most Asian markets you can find a bunch of dorayaki which is not quite the same but might hit the spot.