glutinous rice
稌 centers on a specific type of rice: glutinous rice, the sticky variety used in mochi and other dishes.
稌 combines the grain radical 禾 with 余, which likely contributes the sound. The character is used specifically for glutinous rice.
The grain radical 禾 beside 余 (which can suggest surplus or extra) points to a special, extra-sticky grain: glutinous rice.
For ト, imagine a sticky rice cake shaped like a toe: toe -> ト, and the glutinous rice sticks to your toe.