Green Skin is right that #1 and #11 belong to Toxic Crusader's Dr. Killemoff.
#6 and #12 are the Kenner Bio-Glow Swamp Thing's weapons.
#3 looks like the projectile for Snap-up Swampthing's tree bazooka accessory, but all the photos I've seen of it show it as green, not orange.
Photos of the Swamp Thing figures: http://www.virtualtoychest.com/swampthing/swampthing.html
#7 might be one of Leopard Man's GITD weapons from the Blackstar toy line.
Some of the others look familiar, but I can't place them offhand. Maybe the spears/staffs might be Battle Beast accessories, but I'm not sure.