Also known as “the guppy.”
Nope the 737 was and is not known as the guppy
http://www.google.com/url?sa=t&rct=j&q=guppy%20airplane&source=web&cd=2&ved=0CEIQFjAB&url=http%3A%2F%2Fen.wikipedia.org%2Fwiki%2FGuppy_Aircraft&ei=C2QpT8qEC-XJiQKzj5C_Cg&usg=AFQjCNHUYXjJVq0-fzSafGCHGJpubAtb4A