Froggatt was a founder in 1891 and later president for a record eleven years of the Naturalists' Society of New South Wales. In 1896 he was appointed government entomologist to the agricultural department of New South Wales.
Froggatt's contributions as a founder in 1891 and his lengthy presidency at the Naturalists' Society of New South Wales laid the groundwork for his later appointment as government entomologist with the agricultural department of New South Wales in 1896.