I believe that Legacy of Ykesha is the expansion where the playable froglok race was introduced. The Berserker class was added in the Gates of Discord expansion and the Drakkin were a part of The Serpent Spine expansion. I am not sure how these relate in EQEmu but maybe that will help you if they are expansion related.
Here is a list of the expansions in order, pulled from Allakhazam's site:
Code:
01 The Ruins of Kunark March 2000
02 The Scars of Velious December 2000
03 The Shadows of Luclin December 2001
04 The Planes of Power October 2002
05 The Legacy of Ykesha February 2003
06 Lost Dungeons of Norrath September 2003
07 Gates of Discord February 2004
08 Omens of War September 2004
09 Dragons of Norrath February 2005
10 Depths of Darkhollow September 2005
11 Prophecy of Ro February 2006
12 The Serpent's Spine September 2006
13 The Buried Sea February 2007
14 Secrets of Faydwer November 2007
15 Seeds of Destruction October 2008
16 Underfoot December 2009
17 House of Thule October 2010
18 Veil of Alaris November 2011
19 Rain of Fear November 2012
20 Call of the Forsaken October 2013
Here is a link to the page on his site for the notes on each expansion.