If I make muffins with frozen muffins do I have to defrost them?

Thanks in advance
You mean frozen berries?

I don't...normally I just get out what i need and sit them in a bowl on the bench while I do the rest of the muffin mix. By the time they are ready to be mixed in they are fairly defrosted anyway, the muffin mix just gets berry colour all through it! I think I have read somewhere you can sit them on paper towel to absorb some of the extra moisture and the colour won't run so much, but I like the swirls of red/black (depending on the type of berries!) through the muffins.