From LEGO Batman Wiki
Ivy Goons are Poison Ivy's bodyguards and helpers. They are mutated botanists. On the DS platform, Ivy Goons are playable. They only attack with their own two fists. They are only playable after completing Botanical Gardens. Ivy Goons are green and their head has flowers on it. Them, like Poison Ivy, are immune to Toxic Green Gas and Toxic Green Goo.