What is a cryptocurrency mutual fund?

Could you elaborate on what a cryptocurrency mutual fund actually is? I've heard the term but I'm still a bit unclear on the specifics. Is it similar to a traditional mutual fund where investors pool their resources to purchase a diversified portfolio of assets? But in this case, are the assets solely cryptocurrencies? How does a cryptocurrency mutual fund operate? Do they have professional managers who make investment decisions on behalf of the investors? Are there any specific risks associated with investing in a cryptocurrency mutual fund compared to traditional mutual funds? Your insight would be greatly appreciated.