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Front frame? Not sure I understand your question.
The Expedition’s front and rear suspension system is unique to it since 2003. But, it has always used the frame (or modified version of it) from the F-150. Expedition has never wandered far from its F-150 based architecture.
The current 2007-2013 Expedition (U324) and 2007-2013 Expedition EL (U354) use the "T" platform (frame) which is directly modified from the F-150’s half-ton class "P" platform.
The P platform was introduced in 2004, and updated in 2009. The frames are hydroformed and have fully boxed construction.