Need help identifying 2011 Lego bag #3, Friends mini-doll legs with dark green pants with brown shoes and dark red bricks?
The minifig is a Friends doll, to be precise, it's Farran Leafshade from the Elves theme.



He appears in two sets in those green pants. Given that you mention the bag you have has #3 printed on it, and the 41076 Farran and the Crystal Hollow set has only 2 bags in it, I believe you have part of set  41075 The Elves' Treetop Hideaway in your possession.



As an FYI: The 2011 printed on the bag indicates the year the bag design was copyrighted - it has no correlation with the year the set was made (which was 2015 for the set in question).