French POW sang about tapioca pudding (9)

I believe the answer is:

frogspawn

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'tapioca pudding' is the definition.
Both the definition and answer are singular nouns.
Maybe you can see a link between them that I can't see?

'french pow sang about' is the wordplay.
'french' becomes 'fr' (abbreviation).
'about' is an anagram indicator.
'pow'+'sang'='powsang'
'powsang' is an anagram of 'ogspawn'.
'fr'+'ogspawn'='FROGSPAWN'

Can you help me to learn more?

(Other definitions for frogspawn that I've seen before include "amphibian's offspring" , "eggs?" , "Future tadpoles" .)

I've seen this clue in The Independent.

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