I f you can get weeds, flowers, cactus, leafs, check the tortoisetable.org.uk for better foods. Otherwise all you mentioned is fine except iceberg. You also need to add more to the things you listed like endive escarole mustard greens collard greens spring mix etc
Hi, if you go with grocery greens the least bad or best depending on the point of view is escarole, radicchio. Some grocery stores carry dandelion greens, arugula is okay too. Romaine is not bad at all, it's high water content can be a good thing, if chopped and mixed with dry grass it becomes a darn good thing.