grasshopper
蠜 refers specifically to a grasshopper, a type of insect.
蠜 combines the insect radical 虫 with 樊, which likely provides the sound. The character was created to represent a grasshopper.
The bottom part 虫 means insect, and the top part 樊 looks like a tangle of legs and wings. Picture a grasshopper with its long jumping legs and folded wings tangled together.
For ハン, imagine a grasshopper hopping into a frying pan: pan -> ハン, and the grasshopper lands with a sizzle.