Yes, yes they can! Carbon Dioxide, for example, is a linear molecule (O=C=O), can absorb infrared radiation, which causes it to vibrate. The vibrations of the molecule eventually emit energy in the form of it's own radiation. This can, in turn, be absorbed by another greenhouse gas molecule, or at the Earth's surface. (Ultimately causing heat!)
Water vapour and Methane do this similarly;
-In H2O (Water), the O-H Bonds absorb the radiation
-In CH4 (Methane), the C-H Bonds absorb the radiation
The amount a gas contributes to the Greenhouse effect is not only dependent on how much of it is present in the atmosphere (the concentration), but is also dependent on it's ability to absorb the infared raditation; in turn, it's ability to vibrate and the amount of radiation it, itself, produces.
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