There are three known artists by this name. 1) Butterfinger was the original name of a Bradford-based rock trio. They released an EP under this name before changing their name to Psychosonic 3.
(http://freespace.virgin.net/unsigned.uk/butterfinger/butterfinger.htm) 2) Butterfinger is also the name of a Canadian band who have released an album of the same name.
(http://www.angelfire.com/indie/butterfinger/main.html - fansite)

Read more about Butterfinger on Last.fm.