As per Squid Game Fandom, The doll recites on a repeated pattern saying 무궁화 꽃이 피었습니다” (Mugunghwa-kkochi pieot-seumnida) . This roughly translates to “the Hibiscus flower ...
To get inspiration, he and his mom decided to visit thrift stores. While walking around one store, they came across the doll section. After looking through the section and not having any luck ...
“They are the Martini,” he says, “using gin; the Manhattan and the Old Fashioned, using whiskey; the Daiquiri, using rum, the Side Car, using Cognac; and the Jack Rose, using applejack.