in today episode of "what is that smell"

A friend of mine got Grumpy Old Manned by his youngest son when he was little. He took the boys ice fishing. The youngest one caught his first and it was too small to keep.He was so wanting to keep it. He must have taken it and put it under the back seat of his dad’s Bronco and forgot about.
When the weather started to warm up it start to smell.
He searched and finally found it. I don’t remember him buying a bunch of pine tree air fresheners though.