Is having irregular patches of discoloration on the tongue a mark of something?

Tongue looks patchy. The tongue is known to have many variations with pigmenting, size, appearance, & not always due to disease. Causes of tongue that looks patchy include: lichen planus (responds to steroids), white sponge nevus (familial, benign, permanent), smoker's leukoplakia (2% risk of cancer, needs biopsy), hairy leukoplakia (due to epsteinbarr virus), warts (due to papillomavirus), "thrush" (rx antifungals).
No. Sounds like geographic tongue to me. Make sure you see your physician to confirm that. It usually is a benign condition.