| Unless you already have a name.
Prickly Rat is not a birthname.
While looking for Russell, Blythe spotted movement in a trash can and checked, only to find a rat. She apologized and covered him back. Russell then tried to hide behind the trash can, but the rat told him to leave, to which Russell commented about him really being rather prickly.
After Blythe retrieved Russell, she accidentally knocked the trash can down and Mr. Sawdust found the rat. After he caught him, the rat told other rats to "keep things warm" until he got out.
A prickly rat also made a brief appearance in The Expo Factor - Part 2, when Blythe was looking in a trash can in front of Littlest Pet Shop for something she could use as a spare hitch for her scooter. She got a lollipop, which the rat got back from her before telling her to go away.