No pawn offer. 2...dxc4 does not win a pawn as many White moves can regain it. The simple one is 3.Qa4+. Later in the game White may sacrifice the pawn, but 2.c4 is not a sacrifice and the opening is not a gambit despite its name.
queen gambit
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Queen’s Gambit:
d4 d5
c4
White offers a pawn to gain control of the center.