This article lists nicknames that characters of the Wallace & Gromit series have been called.
Anti Pesto (Wallace and Gromit work together to get rid of pests, they're self employed at this job) it wasn't a nickname for Lady Tott.
Pesto (Victor Quartermaine)
Puddle-Headed Peasent (Victor Quartermaine)
My little Cheesecake, My Vanilla Slice, My Shortcrust, My Sugar Dumpling, Minced Pie, Utter and Complete Fruit Cake, Gooseberry Fool (Piella)
Old pal (Wallace)
My little Poochy-Woochey, You Meddling Mutt (Piella)
My love (Victor Quartermaine)
The Bake-O-Lite Girl (Wallace, herself)
Madame, My Fudgecake, My Apple Streudel, Dearest, My Spongecake, My Petal, My Precious, My Flower/Flour, My Angel Cake (Wallace)
Auntie Piella (herself)
Fluffy, Fluffy-Wuffy (Piella)