Is it possible? Yes.
Can you defend it? Yes.
You should have trademarked your logo/name within that first year that you published the app. However, that moment has passed. If you can prove that you were publicly using the trademark before they filed, you may be able to call dibs on the rights to it.
It won’t be a simple process so you should talk to an intellectual property attorney ASAP.can help. Check out our website and sign up for a consultation with our affordable lawyers. You definitely want to deal with this sooner rather than later.