Exhaustive research (I typed "Wild Kids" into IMDB) shows there is a Swedish reality-tv series for kids called "Wild Kids".
http://imdb.com/title/tt0467140/
"Wild Kids" (2005)
Kids between ten end twelve divided into two teams are camping at Kolmården zoological Park. They compete against each other and experience action packed as well as knowledge based contests, where one of the prizes in every episode will be a new team mate who reinforces the group in time for the final competition and the first prize. We will also take part of the kids every day life in their camp, constructing shelter, cooking over an open fire, home sickness and what they talk about in the evenings.
The settings of the pictures are consistent with that. Since none of the kids names are on IMDB some more searching was required to confirm it's a match. I don't speak Swedish, but these links seem to show this is the series and those girls are from the 2nd season in 2007 (which might still be showing, if anyone has access to Swedish TV).
Swedish Wikipedia entry:
http://sv.wikipedia.org/wiki/Wild_Kids
Official website:
http://www.svt.se/wildkids