I second that; My adults surprisingly don't seem to be interested in the toadlets as a prey. I would however not risk it if EVERY toadlets' life is dear to you, it might of course happen that one or two gets eaten, no guaranties..
In my experience the toadlets will grow out quite a bit faster than a year. My first batch, crawled onto land beginning of June, are now way too big to be eaten by an adult. They are still quite a bit smaller than the adults though but I expect that within a couple of months they will be the same size. If you want them to grow quickly feed them A LOT and house them in a reasonably warm and stable setting. I kept some toadlets outside during the Dutch summer and they are about twice as small as the inside crew. They were fed with the same amounts but never seemed as interested in food as their inside siblings. Im suspect this has to do with the colder temperatures at night that slowed down their digestive system. Interestingly enough now that I took them inside they still seem to have much less of an appetite than their siblings who where raised inside. Perhaps they need some time adjusting..