For those of you who might have an objection to this idea, I have tried to anticipate those objections as best I can and included them in my proposal.
"Klingons don't have scientists"
This is wrong.
Since the TOS episode "Day of the Dove" we know Klingon warships carry science officers.
"But Mara was Kang's wife"
True, but "A Klingon's life is his work not his family." -Klag
So it is very unlikely she got that position had she not been suited for it or had there been no need for it on a Klingon Battlecuiser.
There was also a science station on the cruiser "Pagh" in TNG "A Matter of Honor" so it's not out of place on a Klignon warship.
"Klingons are conquerors, not explorers"
While Klingons enjoy conquering quite a lot, they have colonies on various worlds that don't seem to have any indiginous population.
And if a world had one, how did the Klingons find that planet in the first place?
Klingons do go out into space to investigate solar systems.
They do so to see if there are planets that are suitable for colonization or have exploitable resources.
If those worlds are populated they might become subjects of the Klingon Empire when warships arrive to conquer them.
Asteroids can contain valuable materials that can be mined via small mining bases constructed in or near them.
Klingons may investigate nebulae to see if they can be used as power sources etc.
For this they need ships with scientific equipment.
Sure Klingon applications of these scientific systems would be somewhat more "practical" than the way Starfleet would do things but the general functionality would be comparable.
For example Starfleet would survey a mountain to learn something about the age and history of a planet.
Klingons would survey the same mountain to see if it contains valuable minerals.
Starfleet would investigate flaura and fauna to learn something about the way evolution occured on the planet.
Klingons would check for hazards and investigate whether flaura and fauna would make them a good foodsource for a possible colonization.
A Starfleet geologist would analyze the tectonic stability of an area out of interest.
A Klingon geologist would check whether an area is stable enought for a colony, a mine or whether it is suitable for a geothermal powerplant.
Different goals, similar means.
Klingons would probably have ships more suited for long-range scouting missions compared to their battlecruisers.
Relative to their size, these vessels would have greater fuel and material reserves (spare parts) for independent operations.
They would probabaly have more dedicated sensor equipment and far less science labs of any kind than their federation counterparts.
Crew size and armament would be limited due to the need to carry the sensors, supplies etc.
So how do Klingons find new worlds to colonise or conquer?
How do they track enemy fleets?
How do they provide jamming and counter-jamming in battle?
"A sharp blade is useless without a sharp eye"- Koloth in
What's still missing from the KDF roster is a military scout.
"But those are not canon"
Is that so?
The Raptor was actually called "scout ship" in "Sleeping Dogs".
Kruge's Bird of Prey was called that as well.
In the unremastered version of TOS there was also a Klingon scout ship.
There is also soft-canon reference to Klingon scouts which were 1/3rd the size of a contemporary cruiser. http://memory-beta.wikia.com/wiki/Klingon_scout_vessel
So it's consistent those are not shuttlecraft but starships in their own right.
Please note that since the crew of DS9 did not just refer to them a "Bird of Prey" it must be a seperate
class while the Bird of Prey was no longer used as a scout.
"Shut up and use the BoP, it's got universals"
Despite this, the BoP is ill-equipped since it lacks the science consoles to do all these things.
In STO "science" does not exclusively equal "research", it equals space for good sensors, jamming equipment etc.
A ship with proper science capabilities of Klingon design is simply missing.
"So you want a Klingon copy of a Fed science ship"
No, what I propose is something seperate from science ships.
I'd like to propose a ship derived from Raptors.
Less guns, more electronic warfare.
Federation designs are pretty much derived from cruisers.
Thus a Klingon scout design would be smaller than an average Federation science ship but more maneuverable.