Tu B'Shevat many people eat many different types of fruit. Growing up and continuing until today there seems to be a Minhag to specifically eat (bukser) carob. Is there some sort of special connection between carob and Tu B'Shevat?
See this link to chabad who explains this well. http://www.chabad.org/library/article_cdo/aid/1109802/jewish/Why-Eat-Carob-on-Tu-BShevat.htm
There are more reasons,but have to find them.