Q.can blackberries be grown in containers
Can blackberries be grown in containers? They came up and then disappeared. I think bugs got them.

Yes, blackberries can be grown in containers. You can read more about berry container planting here: https://www.gardeningknowhow.com/edible/fruits/berries/berries-growing-container.htm
There could be a number of reasons that your seedling plants disappeared besides insects. They could have been eaten by rabbits/deer or the seedlings could have shriveled up and died (damping off disease possibly due to over-watering).
For more information on growing blackberries, please visit the following link:
https://www.gardeningknowhow.com/edible/fruits/blackberries/growing-blackberry-bushes.htm