The dead animals are believed to have been part of a group of six spotted in The Wash on Friday.
The whales are believed to belong to the same pod as 12 others that stranded and died in the Netherlands and Germany earlier this month.
It is unknown where the rest of the pod are, but on Saturday concerns were raised that more of the animals could become stranded and die.
Dr Peter Evans, director of the Seawatch Foundation, said the whales probably swam south looking for food but got disorientated.
"They feed on squid and what's probably happened is that squid came in and the whales fed upon them but ran out of food," he said.
"The further south they got the shallower the water gets and when they got to Norfolk, which is very, very shallow, it's quite difficult to navigate and they tend to lose their way and actually strand."
