The whale vomit is used to produce perfume and can fetch more than £10 a gram.
Rarely recovered on British shores, ambergris is usually found on the coasts of the United States and Australia.
But yesterday's discoveries took the total ambergris finds in North Wales recent weeks to four.
Mick Dunn, of Tuebrook, Liverpool, was staying at a Towyn caravan park with wife Sandra and their children Mitchell, seven, 10-year-old Ged and their cousin Ian Clarke, six.
He realised the youngsters had stumbled across ambergris after reading about the latest find in the Daily Post.
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