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Your tomatillos are probably a variety that naturally produces small, cherry tomato-sized fruit inside the husk. If the plant itself is small, it may be a problem with lack of water or the plant may need to be fertilized.

This article may also help: https://www.gardeningknowhow.com/edible/vegetables/tomatillo/tomatillos-are-too-small.htm

Uneven watering, pests, disease or temperature changes can effect your plant. Unripened fruit can be placed in a brown bag for a few days and used. Here are some links with more information:

https://www.gardeningknowhow.com/edible/vegetables/tomatillo/growing-tomatillo-plants.htm

https://www.gardeningknowhow.com/edible/vegetables/tomatillo/empty-tomatillo-husks.htm

https://www.gardeningknowhow.com/edible/vegetables/tomatillo/harvesting-tomatillo-fruits.htm

This link will help you.

https://www.gardeningknowhow.com/edible/vegetables/tomatillo/harvesting-tomatillo-fruits.htm

This link will help you pinpoint the issue.

https://www.gardeningknowhow.com/edible/vegetables/tomatillo/tomatillos-are-too-small.htm

Yes, you do need more than one to get a significant harvest. I have never seen one without a husk, though. It is possible that it was mis-labeled, or maybe a different plant seed mixed in. Some pictures will help me to help you better, if you can upload some.

Yes, they are safe to eat. Slightly unripe, green tomatillos are preferred for Mexican salsa verde, since they have a more tangy flavor. Very unripe ones may not be tasty but they may ripen further if you place them in a paper bag for a few days.