This thread is rapidly approaching the point where the kids will be in college before you get to the bottom of the thread. Regardless I will re-cite a couple references that have popped up before, but nopt here.
1. Ruth Crawford Seeger's "American Folk Songs For Children" It's a great book that's been reprinted in paperback over the years, or check the children's section of your library. Some years ago Mike & Peggy Seeger recorded most of the song from the book on a 3 record vinyl set (Rounder Records). I think it has been reissued on CD but may be hard to find. Seeger's Animal Songs book was noted above.
2. Marcia & Jon Pankake's infamous "Joe's Got A Head Like A Ping Pong Ball" (see "naughty" thread) When I used to sing for Cub Scout meetings, I got lots of good stuff out of there (one of my kid's is in college now, I told you so).
3. Bill Staines "The Happy Wanderer" (cassette or CD) a relatively recent album for young & old kids.
re: Winken Blynken & Nod - It was once recorded on an album by the Simon Sisters. One member of the duo, Carly Simon, did go on to have a career of sorts.