Hmm. Dunno. Looking a pics of chile petins, some look oval and others look like a regular, though small, elongated pepper so don’t know if all the pics are correctly identified. My mystery plant is a vine rather than a upright plant, though that might be because it was under some weeds. The fruit looks just like banana peppers (which I have planted) but are miniature. Normally, I’m not afraid to willy nilly taste something unknown but this I kinda am.
When I venture back out into the heat again, I will try to get a picture of my Chilitepins so you can look at the leaves and immature peppers. Somewhere, I got the idea that they are round and English pea sized, But I wouldn’t bet the farm on it.