"It has really taken off," he told Swedish news agency TT about the story.
The phenomenon has a name. Kukön, or in English, "dick island".
Stohm actually finished the project years ago, but it's only recently gathered steam online. The island has featured on SVT, SR and in Ulricehamns Tidning in the past couple of weeks, as well as racking up tens of thousands of views across various social media platforms.
"I think the lads at work showed photos of this poor island when some people from SVT were visiting," said Stohm. "Then it just became what it became. Brilliant. It turned out brilliant."
Stohm built the pond, and island, in 2019 together with a friend, just south of Ulricehamn some 100 kilometres east of Gothenburg. In previous interviews he has described the design sprint as "a couple of crates of beer, two nutters and an excavator".
The island measures just over 28 metres by 11 and 18 metres, depending on where you measure. The shape is best seen from above, but there is also a small lookout spot by the pond with a good view of Kukön.
"We actually had our wedding up there on the hill," Stohm shared with a big laugh. "My wife has plenty of her own crazy ideas too, so she just laughs at it."
He is careful to point out that he applied for and received all the necessary permits for his pond construction. But following the success, he has new – still secret – plans for other projects.
"Yes, I have to outdo myself now somehow, before someone else does. I just need to manage to get hold of an excavator again."
For anyone wondering why this story sounds vaguely familiar, it's probably because it's not the first time that giant genitalia has caused a stir in Sweden.
In 2018, a painted blue penis was unveiled on the side of an apartment building in Kungsholmen, central Stockholm, as part of a project by an organisation that arranges murals on residential buildings. Art usually remains on the walls for around six months before being replaced by a new piece, but the penis was erased prematurely due to a high number of complaints.
This came just a few months after authorities in the Värmland region appealed for information after an oversized wooden penis was found in a local park, sitting on a tree.
But perhaps the most famous work in the genre was the Gothenburg snow phallus that appeared on a frozen moat in the western city. A cleaning company removed the offending artwork, prompting a backlash and a new, even bigger snow penis to be created in its place.