Whether historically and linguistically correct or not, I see no reason why we cannot use the term "Karud" to name a specific type of knife that otherwise lacks a specific designation.
If we use the historically and linguistically correct term "Pesh-kabz," it will be rather ambiguous as we won't exactly know whether it is a straight blade knife or a recurved one.
If we use the even more historically and linguistically correct term "Kard," it will be even more confusing as it may refer to almost any type of knife from the Indo-Persian area of influence.
However, naming it "Karud," everybody will know what we are talking about.
Or at least I will...
PS: I think Estcrh was trying to point to the same idea since we had a discussoin on this topic in an earlier thread.