frogspawn n. jocularly, tapioca or similar starchy pudding. Editorial Note: The appearance of tapioca does very much resemble egg masses laid by amphibians. (source: Double-Tongued Dictionary)
Further reading
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Your earliest cite may be 1991, but the usage is much older – I first came across it in relation to the school dinners at grammar school in 1946!
Yes, of course. As I note on the about page (the equivalent to a print dictionary’s frontmatter), I do not make an exhaustive effort to track down the first cite ever for entries.