Jeff (aka heyjeff.eth, jefe) has developed an app to bring NFTs to life, inspired by the popular 'Tamagotchi' game. The Build-A-Noun app will allow users to generate, access, and download Nounish animations on demand for cc0 use, with over 467,000,000 possible animation outcomes. Additionally, users can interact with their Nouns through an interactive app with actions like eating, sleeping, playing, and more. The goal is to empower people to actively use Nouns in engaging and easy ways to help spread the meme.