gugan.

c1840 N. Mackenzie in J. B. Mackenzie Episode Life Rev. N. Mackenzie at St. Kilda (1911) iii. 47 When it [sc. the young gannet] is about a month old it is called ‘guga’, and looks like a young white lamb.

1897 H. A. Macpherson Hist. Fowling xxii. 207 Before the young Solan-Geese, which they call Goug, fly off, they are larger than the mothers, and excessively fat.

1938 Brit. Birds 31 292 A party of men..undertake the unpleasant voyage to Sula Sgeir and stay there a few days, taking all the gugas, or nestling Gannets, they can.

1953 Scotsman 13 Aug. Eight Ness men..are spending 14 days on the uninhabited rocky islet of Sulisgeir,..killing and salting the young of the gannet known locally as the ‘guga’.