No, you cannot use eyelash glue for elf ears. Eyelash glue is specifically designed for attaching eyelashes and is not safe to use on any other body parts, including your ears. Elf ears should be made from materials that are specifically designed for the purpose of creating elf ears and should be attached using specialized adhesives that are safe for skin contact. It is important to use products that are designed for their intended purpose in order to ensure the safety and proper function of your elf ears.