So, what are imps?

Yesterday I leaned the fiends summoned by Dark Alley Pact count as imps. 1) kudos to my opponent who used that little known fact to summon 2 8/8s on turn 5. 2) why? It says they are fiends? Is there an actual definition of imp as a tribe?

The critter in the picture is an imp. If it’s an imp, it counts basically.

Now if they were to add Imp type creature to the game, i could see that card being changed to match that. Then again imps are all demons so i don’t see that happening.

i do wonder if there are any imps in the game that they forgot to code into counting towards that.