Yeah, the big thing is just making sure you know exactly what you're putting in your mead. I like fresh just because I can go to the store and hand pick everything that will go in my must and I think that in general frozen fruit is poorer quality. That said, plenty of people use frozen fruit and it's fine. We only care about the flavor after all. You'll see lots of brew stores/websites selling fruit purees which is another option.
If you do get fresh fruit, I recommend freezing it for 24-48hrs and letting it defrost before adding it, or pureeing it yourself. Freezing has 2 benefits: it can help kill any bacteria or fungi you don't want in your mead (should go without saying that you should wash it before freezing), and freezing will create micro tears in the fruit's skin so the flavor is better released. Pureeing yourself is just making macro tears to help release the flavor
Edit: damn it Dadux, you got in while I was typing mine haha