tracydr.... we have frozen greens, chard with good results... for your question about amaranth check with this fb page... someone should be able to answer your question: https://www.facebook.com/groups/WlidFermentation/

I have had great success with drying both, then using the dried leaves like parsley flakes in any number of recipes. The only thing it doesn't work for is the thick ribs of the chard. You could dry in the oven if you don't use a dehydrator.