One time I got into an argument with a former friend, we had got into an argument about the Jewish treatment in ww2 and concentration camps. My argument was that the Nazis rounded up Jewish people to execute them, using the treatment of Native Americans as an example.
They claimed that a lot of Jewish people died due to bombing of supplies and a kind of bug that I can only recall was similar to bed bugs or a flea.
My question is: Is there any historical possibility for this to be true?
You mean lice.
Lice spread typhus, and yes, there were typhus outbreaks in the camps, from which quite a few people died.
But where's the contradiction? It is true that there were typhus outbreaks and it is simultaneously true that Jews were deported en masse to the extermination camps. Most Jews in the camps died from having been murdered by the Nazis, not lice.
(This reminds me of another denier fallacy - that since Zyklon B was a delousing agent (i.e. something that kills lice), used to prevent typhus outbreaks and save inmates' lives, then it wasn't used to kill Jews. These dummies then can't explain why it couldn't be used for both.)
Moreover, this Holocaust-denier canard cannot apply even in principle to the pure extermination camps like Treblinka (about 800000 victims), Belzec (about 430000 victims), Sobibor (about 180000 victims), Kulmhof (about 150000 victims) since those were not concentration camps in the first place. They were very small patches of land where no more than a couple of thousand persons could live at one time. Their only function was literally extermination.
Now, Auschwitz-Birkenau was both a concentration camp and an extermination camp. But most of the Jews that died there (about 800000 out of about 900000, with the total death toll, incl. non-Jews, being about a million acc. to more recent data) never became its inmates since they were gassed after a selection upon arrival, which means typhus couldn't make a contribution here in principle.
Next point to consider is that the absolute majority of these victims died long before the bombings might have begun to have some sort of an effect. Nor is there any evidence that they had any effect on, say, food supplies to Auschwitz.
Finally, about half of all Jews died outside of any camps (due to mass shootings, starvation in the ghettos etc.).
So it's a bogus, ignorant, deceptive talking point throughout.
Not to mention that putting innocent people into typhus-ridden camps is also murder.
Ultimately the main purpose of German concentration camps was to kill the inmates. Although outbreaks of diseases carried by bugs that infested the barracks definitely occurred, the majority of the people who died were either gassed or worked to death. Upon arriving at a camp (note that not all camps had facilities for mass extermination like the gas chambers at Auschwitz so I am generalizing a little) the inmates ( I say inmates as although many were Jewish, the Nazis also sent Blacks, gays, Roma (gypsies) and the mentally disabled to camps) were separated based on if they could work or not. The old, sick, young and many of the women were sent to be killed immediately as they couldn’t perform hard labor or any skill that the nazis viewed as useful to them. Those that looked able to do hard labor as well as some skilled professionals like doctors were used as slave labor and attractive women were selected for camp brothels where they were kept as sex slaves. I apologize if I got a little off of your original question but I thought additional information might be of use to you in your argument with your friend. Ultimately though, bugs were not the main cause of death at concentration camps.