Jason:
I don't know that I'd characterize the 4th at Lawsonia as a concrete frog ( and I love the notion of this!). That's a very solid, Redan-esque par 3 that's just a good, hard, uphill par 3 with a putting surface largely unseen from the tees. I'm not sure it's as good as the 10th, but as a hole, I think it's a better piece of architecture than the more famous boxcar 7th.
The 4th for my tastes has some fundamentally sound and tested architectural principles at work -- deep fronting bunker, trouble long that you can't see, a somewhat blind target, and a large, wide green that allows for multiple pin positions to tempt the golfer.
I think the 17th may be closer to the concrete frog concept -- a hole that doesn't get much notice, but one of strategic interest on one of the flattest portions of the course.