Those guys are human-sized in 15mm, so they'd be at least 9'' tall in 10mm.
Here are some temporarily based on 20mm pennies:
And here's one next to a large 1/72 hoplite (at least 24mm tall). I'd say they're D&D-goblin size in 1/72 rather than 15mm:
A Copplestone 10mm orc come up to around the waist of an Alternative Army goblin (see attachment), so I think you'd be better off using Copplestone half-orcs.
Hope that helps!