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From what I understand, Kroot Warspheres only ever deploy when the money is right, and that when they do deploy, they bring quite a lot of Kroot. What kind of transportation do smaller groups of kindred make use of when they don’t deploy Warspheres? Also, is there any material I can read to learn more about just the Kroot themselves?

Dahyak Grekh from Blackstone Fortress has his own small ship called the Kravv’cha’to -

 Apple Peel wrote:
From what I understand, Kroot Warspheres only ever deploy when the money is right, and that when they do deploy, they bring quite a lot of Kroot. What kind of transportation do smaller groups of kindred make use of when they don’t deploy Warspheres? Also, is there any material I can read to learn more about just the Kroot themselves?

You're probably going to find all that's available in the various tau codicies and 40k wikis (lexicanum etc).

They had a WD army list a decade ago and I believe some index xenos, which yo might be able to find floating around. But in my experience most of this makes it way onto the various wikis.