Frog Tosser requires six lands though. It is like comparing Thyrian Golem to Deepwood Grizzly. Both cost the same amounts of Faeria but the former has +2/+2 over the latter.
Frog Tosser does that in the shape of spawning a Frog, and is also a creature, so I’m inclined to agree Frog Tosser needs another nerf. On the other hand you have to consider that Firebomb is not a good card as it is pretty much directly outclassed by Flame Burst, which can hit the opposing Orb as well and is 1F cheaper. However, I still agree 1 Faeria compared to Firebomb is not enough (maybe make it 6F?).
Comparing Blazing Salamander to Emerald Salamander is not quite fair considering the former is a bad card to begin with and the latter is significantly worse than Crackthorn Beast.
All Emerald Salamander does is highlighting Blazing Salamander needs the buff it needed for a long time already.
Tree of Everlife is indeed quite ridiculous. Ten lands is a LOT, more than any other card, but late-game most decks have played ten lands to begin with so that really doesn’t matter unless a significant percentage actually were forests (which is not the case). I think the first change to the Tree should be 6 Forests and 4 Wild lands and then have another look at the card (as I’m pretty sure it’s still OP even with that change in mind).