Daycare advice💕

I'm fairly new to working in daycare but in the couple months I've been working here I feel like I've grown a lot and I'm doing so good with my kiddos!

However when it comes to going to the bathroom after nap time they won't stop playing in the toilet! Some are almost 2yo and others are 2+ year old boys and only one of them has been trying potty training at home. They're all in diapers, we have 2 toilets in the bathroom. While changing one of their diapers there's at least 2 of my kids playing in the toilet water splashing it all over the floor at the same time.

I've tried singing to them, I tried bringing toys to play with (ended up in the toilet 🙃) and I've tried sitting the ones who are worst with splashing in the toilet next to me but nothing is working. I don't have anyone with me after nap time and I can't block off the toilets.

Does anyone have any advice?