The answer is no. Iconfinder cannot give you permission to use an icon for a certain purpose, since we do not own the rights to the icons. Instead you need to check the the license information for the specific icon.
You can find license information for individual icons by pressing the information button at the bottom right of each icon. You can also see a link to the license information by clicking the icons itself.
The only one that can give you permission to use an icon for other purpose than the one specified in the license agreement is the author of the icon, for being the copyright owner.