All of the following sense organs in frog have the cellular aggregation around the nerve endings, except

Frogs possess well-organised eyes and internal ears for vision and hearing, respectively, featuring complex structures like the cornea, lens, and retina in eyes, and the tympanic membrane and cochlea in ears. Conversely, their organs of touch, taste, and smell—sensory papillae, taste buds, and nasal epithelium—are primarily cellular aggregations around nerve endings, indicating simpler structures. While eyes and internal ears facilitate sophisticated sensory processing, the tactile, gustatory, and olfactory senses rely on basic cellular arrangements for detecting touch, taste, and smell stimuli, respectively.