With out the plants flowers to help with the ID, I could only speculate for you. Maybe something in the Alocasia genus, probably A. portei Schott (?). Click on images from the included link below to enlarge. I suggest you get in touch with the folks from the included for further help for ID confirmation. Best wishes! https://florafaunaweb.nparks.gov.sg/special-pages/plant-detail.aspx?id=5480