Are these salvageable?

These poor leek and onion were victims of the 'great plastic greenhouse collapse of 2015'. A month on they don't look any better, though some are maybe a couple of cm taller (if still slanted).
Is it worth carrying on with them or is it best they become a snack for my chickens?

 

Leeks have a long time to go, you wont be harvesting till next winter I assume, so its early enough to sow some more.
Personally, I tend to sow in one large pot, then once they reach a decent size I plant out, in a deep hole made with a dibber.

BTW, the ones you have there will still probably make it, its just that you really dont need all those pots.

 

I tend to grow onions in those trays divided into sections.
About three or four seeds to each section, I then feed if they dont look too good up until planting time.
They dont have much of a root system at the early stages.

 

It might depend on how old they are but they look fine to me. Leeks are a bit of a slow grower in my experience. As pete said you could put the Leeks in one big pot and they'd still be happy.