They are not like string beans. They have a more bitter tasting, more like the taste of leafy greens or even asparagus but stronger flavoured . It is hard to describe. It has a unique taste. It seems that you either love them or you hate them, there is no in between. lolI have never heard of fiddleheads or seen them before. I do not know if we get them here where I live. From what I am seeing in the photo here, they resemble string beans. Are they anything like string beans? What do they taste like? I will have to ask some people around here if they have ever seen them or if they know about them. They seem like something I could use though. I like most vegetables.