I was wondering, with the new Debris Gambit, can a ship take the action, get two evades and then feed both those to another ship with Swarm Leader?

Swarm Leader mentions that you can only choose two ships who feeds it, but can those two ships now feed both their evades? Add 1 die for each token removed makes me think one could remove 2 tokens per ship, getting 4 extra dice.

Or is this another case of do what the card says, not what it doesn't say?

Swarm Leader says to remove 1 evade token from each of those ships and add that many attack dice, so it's probably safe to say you can't remove more than 1 from each ship. But, it would allow you to feed the leader extra attack dice while still keeping an evade for their own defense.

You could also feed a ship attacking twice or more per round like Quickdraw.

I suppose another question is: does each attack performed require evade tokens to roll extra dice? If you have gunner, or a TIE/sf with a rear arc and a second attack, would you need to spend tokens for both or is there any carry over?

Spend for both.