Boko haram insurgency army kills two lake chad

I think there may be a mistake in your question. Boko Haram is a terrorist group that has been responsible for numerous attacks and kidnappings in Nigeria and the surrounding region, but I'm not aware of any information about them killing "two Lake Chad".

Lake Chad is a freshwater lake located in the Sahel region of West Africa, and it's not a person or a group that can be killed. It's possible that you may be referring to a different incident or a misunderstanding.

If you could provide more context or clarify what you mean by "two Lake Chad", I'll do my best to help you with your question.