Yes, generally “blind” takedowns would be takedowns where you can’t see where you both are going to land (and therefore cannot see potential obstacles or hazards that you might land on).
-pretty much anything that involves a “back arch”
The opposite would be takedowns where you can clearly see where you (possibly both) are going to fall and so can choose to avoid possible hazards or possibly use them to damage the opponent. You also pretty much want to try to primarily develop takedowns where you are “on top” the whole time you (both) are falling to the ground so you can use the opponent’s body as a crash pad once you hit the ground (both to damage them and protect yourself) of need be.
Examples would be:
-that backbend takedown flats posted above
-Osoto Gari or any takedown where you “trip” your opponent backwards (including things like Double legs, single legs, high crotches, ankle/knee picks, etc…)
-snap downs, collar/arm drags, climb behinds, etc…
-hip/shoulder/arm throws where you can see where you (both) will land