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According to the Forgotten Realms wiki article on Draegloths, they are perhaps the only variety of half-fiend that was created regularly and intentionally by a mortal race. (Monster Compendium: Monsters of Faerûn, p. 59)
Are there any other half-fiends except for Draegloths that were created intentionally by a mortal race?
Depending on your interpretation of "regularly and deliberately", there is at least one race that qualifies:
Races of Faerun
The result of four noble houses of sun elves breeding with demons in an attempt to strengthen their bloodline, fey’ri are a type of planetouched that breeds true among their own kind. Marked by their fiendish blood, fey’ri are unique among most planetouched in that they have a self-sustaining community, so they are raised among their own kind.
In addition, there are several races that are the result of interbreeding (Maeluth, Wispling, Alu-fiend, Cambion, etc.), however there is no direct evidence that these were deliberate and regular on the part of the mortal, rather than the fiend.
