Since this thread got necroed, I updated my version of the slaad (now called a true slaad) with dave2008s help, and you can find the latest version here: D&D 5E - 5e Updates: Monstrous Compendium
I like this, while I love froggy beasties I never liked Slaad because they were boring anti-chaotic. This though brings back the chaotic nature in a useful package.