Is there such a thing as blind pimples?

Yes. Blind pimples are closed whiteheads that are not unclaimed. Topical salicylic wash can open these or prescription retin a (tretinoin).
Yes. 'blind pimple' is a colloquial term for deep pimples that have not yet "come to a head." as with any pimples, it is important not to manipulate them as it can lead to an infection. Simple home remedies should be limited to warm compresses and gentle cleansing. If you have a recurrent or worsening problem, see your dermatologist.