Woohoo, multiple newts, Mr-Pond!!! See, you have newts, I have bullfrogs. We need to do some trading and share with each other. LOL Wait, I don't think that's allowed overseas. Ho hum ....
Gardenlady, the toads are likely dying because they do into the pond to lay lots and lots of eggs, but if they can't climb back out, they will drown. Put a stick or two over the edge, so they can climb back out. Not sure about your fish dying issue, though.
As far as the "froglets" you are seeing hopping around, those are probably not babies, they are peepers or some other type of small frog. I have them and some of them tend to never go into the pond, they love the foliage around the pond instead. I have Northern Cricket Frogs and peepers here this year, besides the bullfrogs. So far only one bullfrog at a time, except once I spotted two in the bog, both hopped into the pond when the spotted me!