The Testaments of the Twelve Patriarchs, dating to 70-200 AD, refers to the fallen Angles as Watchers.
Here are two relevant sections of that text.
Section The Testament of Naphtali, The Eighth Son of Jacob And Bilhah, 3:4-5
…become not as Sodom, which changed the order of nature. In like manner the Watchers also changed the order of their nature, whom the Lord cursed at the flood, on whose account He made the earth without inhabitants and fruitless.
It also notes the following in section The Testament of Reuben, The First-Born Son of Jacob And Leah, 5:6-7
…thus they allured the Watchers before the Flood, for as these continually beheld them, they lusted after them and conceived the act in their mind; for they changed themselves unto the shape of men and appeared to them when they were with their husbands; and the women, lusting in their minds after their forms, gave birth to giants, for the Watchers appeared to them as reaching up to heaven.
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