"CryptoStocks" is a term that combines "cryptocurrencies" and "stocks", and typically refers to the trading of traditional stocks of companies operating in the cryptocurrency space, or sometimes to financial instruments that represent ownership of certain cryptocurrencies in a structured way similar to stocks.
In other words, instead of buying Bitcoin or Ethereum directly, you might invest in shares of major companies like Coinbase (a cryptocurrency trading platform) or MicroStrategy (a technology company that holds large amounts of Bitcoin). These companies are significantly affected by the fluctuations of the cryptocurrency market, making their investment close to exposure to the crypto market but through the traditional stock market. It can also refer to exchange-traded funds (ETFs) or other products that track the performance of cryptocurrencies but are traded on traditional exchanges. This provides investors with a way to gain exposure to the cryptocurrency market without needing to directly own the digital currencies themselves, thereby reducing some of the technical and security complexities associated with dealing with digital wallets.