Dárky
The plural of dárek, (gift).
Díky
Prounounced „dee kee“, it is the short form of the much more difficult to say děkuji (dee eh ku ee). Unfortunately, it is also considered quite informal to say díky, so don’t test it out on your boss.
Co je český – to je hezký
You probably know that „díky“ is also plural nominative from „dík“ that is the noun for the act of thanks. There is some old czech phrase „tisíceré díky“ meaning something like „děkuji mnohokrát“ (meaning thank you very much, but by now you probably know).