For the purpose of looking up, apkmirror and apkpure tell you if an app is for androidtv or not. An uncertified device can also access the tv playstore with proper OS modification (did on 2 different devices myself).
Google play on the Web has a TV tab that shows what's available on tvs.
I assume you can access the app store for not only Android TV but also for your car as well.
Open up Google play store, click other devices, and then press the TV tab.
I’ve been seeing an option to select which device to install apps to from the Play Store on my phone and it shows both my watch and Hisense tv
If you ever linked a Google Tv or Android TV device to your account before, the Play Store on your phone lets you pick which type of app you want to look for TV or Phone.
So you have any specifically you want to check for? I can just do it for you on mine.
no
Well I guess you can download the SDK and run the emulator, but other than that, no.
Here you go,
Apps - https://play.google.com/store/apps?device=tv
Games - https://play.google.com/store/games?device=tv
But looks likes the filters are buggy and not showing the full list.