According to their FAQ (https://furilabs.com/faq/), yes

  > FuriOS allows for running apps inside a container running Android codenamed Andromeda. This container has complete integration with the host and makes all Android applications work like native applications

Yes, both (official) SailfishOS and FLX1 offer decent/good Android app support. Not every app will work, but when I have needed Android (rarely, for basic stuff), the applications have worked.