rice cake
粿 centers on a food made from rice that is shaped into a cake or solid form.
粿 combines 米 (rice) with 果, which likely contributes the sound and the idea of a formed result, suggesting rice shaped into a cake.
Rice 米 is combined with fruit 果 to make a solid rice cake, like a fruit-shaped rice treat.
For カ, imagine a car made of rice cake: car -> カ, and the rice cake is so firm you can drive it.