Hi,
Hmm, curious. SpringBoard is the internal name for what is basically the window manager/shell in iOS. It is the process that manages displaying the Home screen, folders, the Dock, etc. You can think of it as being analagous to Explorer in Windows or Finder in MacOS. In other words, it's not really an app as such, as more as it's a core part of the operating system. Strange that it's showing up - I'd guess that will either get removed or re-named to something else in the list. Either way, it's nothing to worry about.
HashtagImages is a new one on me. Some quick Googlings seem to suggest it's the internal process responsible for graphical image search from the keyboard. Never used it myself, I'm assuming it's the "search for an animated GIF or meme" type thing I've heard about but never gone looking for. As I say that's just going from some random pages I'm finding on Google, but that would be my best guess. Again, I'd suspect that this showing up is either a bug, or it's a placeholder name that'll get changed to something more human-friendly in a later release of iOS.