Is rajoria thakur a sub caste of thakurs?

Well, honey, technically speaking, "Rajoria Thakur" is a specific clan or lineage within the broader Thakur caste in India. So, yes, it's a subgroup of Thakurs. But let's not get too caught up in the semantics, darling. Just know that they're all part of the same big Thakur family tree.