Names

[James Williams]

I'm embarrased to admit that I'd didn't recognize a bunch of names
on the International Disney Comic Character Name list.  Who are 
the following and where did they appear:

April, May, and June
Newton
Fethry Duck
Porpy the Porpoise
Dim-Witty
Clara Cluck
Gilbert
Idgit the Midgit
Dangerous Dan McBoo
Witch Hazel
Izzy Wolf
John D. Rockerduck
Hiawatha
Sylverster Shyster
Shamrock Bones
Captain Churchmouse
Filo Fganga
Little Toot