I also find the green squeaky duck cute!!!
How do you handle the green roof? That is still open for us as well (but due to empty coffers, it is being postponed for a few years). And we were told it’s better not in autumn, but in spring. However, the proposal for us was ready-made mats (which apparently look like egg cartons and already have everything in them, substrate and appropriate seeds). Therefore, I would be interested to know how you do it.
How warm is the pool by now?