If you capture one [Stem Toad] you can issue the MAKE order: M 150. This takes 5 Action Pts and you'll need a Knife to remove its special gland. You may carry 4 of these glands. Special note: You cannot acquire the gland by first killing a Stemtoad - you need to extract it from a live one.
Stemtoad
Captured (5) 
Stemtoad