It is something you really have to test for yourself, amount, type of fruit, what it is mixed with, eaten first thing or after dinner, and the progress you are seeing in reducing BG levels, all affect how you cope with fruits.
I use frozen as it means there is no temptation to finish off a pack before they go off.
If I accidentally defrost too many I make a sugar free jelly with less than the normal amount of water, let it cool then whisk in the fruit, and sometimes some yoghurt or cream if it is new, not close to the use by date, and it makes a good dessert for several days.
I do try to remember to return the pack to the freezer, but it doesn't always happen.