Japan offers short-stay visa exemptions for tourism. The list of countries that are eligible for visa exemption can be found at Exemption of Visa (Short-Term Stay). The citizenship of the visitor is the only thing that is relevant for Japanese visa exemption (US permanent residency status has no bearing).
No, Japan only cares about your country of citizenship, they will have to apply for a visa via the usual process. The only thing a green card gets you is the right to apply for a visa at a Japanese embassy/consulate in the USA, and tourist visas are usually processed in 2-3 days.
Credit:stackoverflow.com‘
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