Cattails aren't too bad to deal with in the spring and most of the summer. I'll uproot them at work the pop off the root system and eat the lower white section of stalk until it gets too fibrous. Really tasty, kind of a mix between cucumber and honey dew Mellon. I haven't tried processing acorns yet, but have eaten some white oak acorn that have started to germinate and they were pretty good. Once they germinate their sugar content goes up and the bitterness from the tannins goes down a bit. Also most nuts like acorns are more nutritious for us at that stage. One of my wild edibles books talks about soaking shelled white oak acorns in a mesh bag in a cool running creek for a day or two as a method of leeching the tannins.