Investing in cryptocurrencies can be highly speculative and risky. While some new cryptocurrencies may offer potential for long-term returns, it's important to conduct thorough research and consider various factors before investing. Here's a summary of the provided information about the top new cryptos for potential long-term returns:

1. Smog Token ($SMOG): This token has gained popularity for its upcoming airdrop on the Solana network and its ability to provide staking rewards on the Ethereum network. Users can accumulate points for the airdrop through various activities. However, investors should carefully assess the token's fundamentals and the potential risks associated with meme coins and airdrops.

2. Dogecoin20 ($DOGE20): Dogecoin20 aims to enhance the original Dogecoin meme coin by introducing staking features to earn passive income and implementing anti-inflationary measures. While it offers a twist on the classic Dogecoin, investors should be cautious as meme coins can be highly volatile and speculative.

3. Scotty the AI ($SCOTTY): Scotty the AI integrates artificial intelligence into the world of meme coins, providing real-world utility through AI-powered products like Scotty Swap and Scotty Chat. However, investors should assess the adoption and sustainability of the AI technology within the project and consider the risks associated with emerging technologies.

4. Sponge Token ($SPONGE): Sponge Token seeks to introduce its V2 upgrade through a unique bridge-to-earn utility, where users stake V1 tokens to receive V2 tokens upon launch. While the project promises exciting opportunities, investors should evaluate the project's roadmap, community engagement, and potential risks associated with token migrations and upgrades.

5. Green Bitcoin ($GBTC): Green Bitcoin offers a predict-to-earn ecosystem, allowing users to stake tokens and forecast Bitcoin's future price to earn rewards. While this model may attract investors, it's essential to understand the mechanisms behind the staking ecosystem, evaluate the project's credibility, and consider the risks associated with price forecasting and smart contract vulnerabilities.