The agency's brief is thought to have a focus on the use of digital and social-networking media, as well as targeting weekly women's lifestyle titles.
Impulse incumbent Cairns & Associates maintained this week that it was ‘business as usual'. Unilever was unavailable for comment, while Frank declined to comment.
Earlier this year Impulse introduced a reshaped can for its new Tease fragrance.
Frank currently works for various Unilever brands, including Sure.