This is only the 3rd cake that Ive covered completely with fondant. I used MMF. Could someone tell me why it has air pockets under the fondant? I couldn't get them out- any secrets? TIA

Its the froggy cake in my photos

sometimes they are caused by a difference in temperature between the fondant and cake. As the cake settles, it can also cause air pockets.

Using a thin, clean needle, you can just pop them and use your finger to smooth the tiny whole.

did you try poking at the air bubble with a pin to let the air out? I have had that happen and the pin worked great. No idea how they happened, but no pin hole was able to be seen.

I tried to use a toothpick but it didn't work too well. I smoothed out the hole but the air was still there

I use a diabetic syringe.

Insert the needle on an angle directly into the air pocket and then pull the plunger back thereby sucking out the air

I have had this happen before..... painful!!
Many moons ago I did pottery and ceramics classes and I recall being told you should always roll clay one direction, rather than rolling backwards and forwards as this could cause air bubbles.
I find working with Pottery and fondant/sugarpaste have very similar principles (the cake stuff just tastes a whole lot better ) Anyway.....
I tried rolling my fondant out one direction only and I have never had a problem with it since. I also do the same when I roll out sugar paste.

Maybe this will help next time.

In the meantime ...On an angle, insert a needle towards one edge of the bubble and whilst slowly pulling needle out smooth down fondant from other side towards needle. I had to do this to blue cake in my pics and you can't tell!!

Never prick a whole straight down into fondant you will have a big trouble trying to cover it.