Hello! Thank you for reaching out! I can see how being able to screenshot on your TV can be useful. As for a device that lets you only screenshot there's not really any out there that I can find. There are some YouTube videos that can show how to do it with a third-party app and a USB storage device, but the results may vary on that. But there are plenty that let you screen record/capture. As for one that's made by Samsung specifically there's not, but you can easily find some on Amazon/other third-party stores.
