I wouldn't eat any ornamental from a store.
Since they aren't sold for eating but as an ornamental the nursery can use all kinds of stuff on the plant that you can't use on edibles.Systemic and other poisons that stay in the plant a long time etc.

Grow seeds from it and then eat the peppers from that plant.
Ornamentals are OK to eat but a lot of them are super hot with little flavor or not hot at all with no flavor.

Only way to find out what yours tastes like,unless it's organically grown is to grow your own and try a few pods.

None of the ornamentals are toxic

My Favorite is Bolivian Rainbow

One was called toxic because the person writting the page couldn't handle the heat. Sorry can't find the name

I love my Bolivian Rainbow's as well they are ornamental but they are also spicy and have a nice sweet, smokey flavor. Then again I've had a couple ornamentals from friends which tasted terrible (but not toxic) so I think it really depends on the type of plant you got.

As for the red skinny peppers it's impossible to say it could be any number of peppers in the annuum family like cayenne, thai dragon, thai poinsettia, de arbol, whippet's tail, goat weed, kung pao, etc