This so sounds like something I would do!!
I had a "feeder" goldfish (a comet) who survived being fed to my water dragon (He was so good at evading him he got too big for the little lizard to eat!) so of course, I was attached to him! I moved him into his own tank and I had him as a pet for 5 or 6 years! (It all ended when I was on vacay and had a power outtage...
)
Anyway, he was pretty darn big and he did fine in a 29 gallon tank with an under gravel filter and monthly siphonings (with a gravel vacuum).
Anyway, BIG pat on the back for helping these little ones out... I can't wait to see pics!!
Oh, and as for the frog... They absorb anything that touches their skin directly into their bodies, which is one of the reasons that amphibians are the first thing to go when there is pollution in a water body.
Oh, you might want to get some slime coat replacer (I think they call it stress coat?) for the goldfish since you were handling them and might have rubbed some of their slime coats off. This will help protect them from disease... especially with all the stress and strangeness they've been going through!!
Ok, I"ll stop now!!