A small mouse-like humanoid which lives in tunnels coming off the main transit tunnels into Hammerdal (in the Lone Wolf series, or more specifically, in book 2). Noodnics are scavengers which survive by stealing small items and gathering anything which is discarded. They are hoarders, and are somewhat afraid of outsiders.
They appear to be sentient, although the effectiveness of Lone Wolf's animal kinship discipline in communicating with them suggests that they are as much animal as humanoid.
The Noodnics might help Lone Wolf defeat the Helghast near Hammerdal, if he is able to obtain their support.