"It's kind of like melted chocolate" is good, natural, informal spoken English. "It's kind of like" is not really "good English." "Like" already carries the idea of "not _exactly_ the same as" so you can simply say "It's like melted chocolate." If you want to be clear that it's only a little like melted chocolate, you would say "It's a little like melted chocolate" or "It's somewhat like melted chocolate." A curious phrase that's sometimes used is "not unlike:" "It's not unlike melted chocolate." Can you decode the meaning of the following sentence? It was written by Douglas Adams, and it's from "The Hitchhikers Guide to the Galaxy." It's intended to be funny. The humor comes from the fact that it takes a moment to understand it. It is talking about a vending machine that dispenses bad tea. Adams says: “He had found a Nutri-Matic machine which had provided him with a plastic cup filled with a liquid that was almost, but not quite, entirely unlike tea."

In terms of your use of English? Yes, you could. But if I were trying to give somebody a good idea of what chocolate ice-cream consists of, then I would describe it very differently. I would say something like: "A mixture of milk or cream and sugar combined with a particular flavour - such as chocolate and vanilla - and then frozen." Perhaps you meant that chocolate ice-cream tastes like melted chocolate? If so, I would simply say "Chocolate ice-cream tastes a bit like (or is a bit like) melted chocolate.

You can say it's kind of like or just it's like. I would probaly say "It's like melted chocolate, only colder".