I have made many clay cake charms, and they have realistic textures. There is an easy technique to achieve a texture similar to this one:
All you need is something with a sharp edge such as needles, the end of an eye pin, a toothpick, etc.
Next, you scratch the clay lightly in circular motions with your sharp object. That would create a cake-like texture.
And then you have a piece of clay with the texture of a spongy cake.
Next, you scratch the clay lightly in circular motions with your sharp object. That would create a cake-like texture.
And then you have a piece of clay with the texture of a spongy cake.