For example: Nidalee mid/top. Kha’Zix mid. Sejuani top or support. Amumu top or support. Zac top. Graves ADC. Xin Zhao top. And so on.
Actually, Riot often does the opposite: Whenever a jungler is going in other positions, they tend to nerf it. They did it with Nocturne for example.
No, you don’t understand. They nerf jungle champions whilst leaving the items that made them OP alone. For example, J4 wasn’t OP, it was the items and now he’s actually a bit weak.