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What I mean is that Grunt has greyish, bumpy ridges on his head. Wrex and most other krogan have smooth, spike-tipped ridges. Why?

Those are supposed to become solid and harden and look like the other Krogans' with age. Grunt is an infant in Krogan terms. TiberiusYakushev 10:56, November 6, 2011 (UTC)

The reason for this is that Grunt is an infant. As he grows up, the ridges will become solid and hard. K1LLERAnish 13:55, November 6, 2011 (UTC)