from The Century Dictionary.
- noun A small cake made by dropping thick batter from a spoon into hot, deep fat, or on a well-buttered pan to be baked in the oven.
Sorry, no etymologies found.
One called her medicine dropper, and another drop-cake, and another dropped egg, and so on; and away they all went into the house, laughing and shouting and tumbling over each other.
Hildegarde's Neighbors Laura Elizabeth Howe Richards 1896
"Ah, it's the day for Grace's party, sure enough," said her grandmother, sighing a little, and stirring faster at her drop-cake.
Little Prudy Sophie May 1869