The Sculpin.

[Fly Tier]

The Sculpin is a bottom-dwelling,compressed and flat-bodied fish with intricate back and side color camouflage markings.They have a chameleon-like ability to alter the intensity of thier existing color,or change colors entirely,as they swim near or rest on the bottom,Typical examples from this group of fish are sculpin,darters,catfish,suckers,and lamphries.Some guides on the White River use Sculpins for bait for big browns.The fly imitations for this bait fish is Whitlocl Matuka Sculpin,Spuddler,and Muddler Minnow.

[jncviper]

I found a small plastic sculpin bait one time that came with a tiny lead head to use it kinda like a jig.  I use to fish it on my ultralight spinning rod.  Caught my biggest largemouth bass to date with one at just over 6lbs. 

[Fly Tier]

That's awesome I have seen people up on the White River by Bufflo City use that same lure and catch 18" to 23" brown trout.