Question: A World War II vehicle with the German word for kitten in its name, was a smaller version of the German tank known by American soldiers as what?

Context paragraphs:
Panzer ace: "Panzer ace" ("tank ace") is a contemporary term used in English-speaking popular culture to describe highly-decorated German tank ("Panzer") commanders and crews during World War II.  While not prevalent in World War II within the Wehrmacht, it was at times used by the Waffen-SS to publicise its most successful personnel, as the SS organisation was far more attuned to the propaganda imperatives of Nazi Germany.  These commanders were credited with the destruction of large numbers of tanks and other armoured vehicles.  The British and United States militaries did not recognise any of their tank commanders for "tank kills" or publicise their achievements, though some were also responsible for destroying a large number of enemy tanks.

Tiger II: Tiger II is the common name of a German heavy tank of the Second World War.  The final official German designation was Panzerkampfwagen" Tiger "Ausf".  B, often shortened to Tiger B.  The ordnance inventory designation was "Sd.Kfz."  182.  It is also known under the informal name Königstiger" (the German name for the Bengal tiger), often translated literally as Royal Tiger, or somewhat incorrectly as King Tiger by Allied soldiers, especially by American forces.

Marder II: The "Marder" II was a German tank destroyer of World War II based on the Panzer II chassis.  There were two versions, the first mounted a modified Soviet 7.62 cm gun firing German ammunition, while the other mounted the German 7.5 cm Pak 40 gun.  Its high profile and thin open-topped armor provided minimal protection to the crew.  Nevertheless, the Marder II (and similar Marder III) provided a great increase in firepower over contemporary German tanks during 1942 and into 1943.  Only four Marder IIs remain today.

Panther II tank: The Panther II tank was a German tank design proposal, based on the Panther tank during the Second World War.  It had thicker armour when compared with the Panther and some standardised components were implemented from the Tiger II tank.  The Panther II never got past prototyping and never was produced.

Marder III: "Marder" III was the name for a series of World War II German tank destroyers.  They mounted either Soviet 76.2 mm F-22 Model 1936 divisional field guns, or German 7.5 cm PaK 40, in an open-topped fighting compartment on top of the chassis of the Panzer 38(t).  They offered little protection to the crew, but added significant firepower compared to contemporary German tanks.  They were in production from 1942 to 1944 and served on all fronts until the end of the war, along with the similar Marder II.  The German word "Marder" means "marten" in English.

Nashorn: Nashorn (German "rhinoceros", pronounced [ˈnaːshɔɐ̯n]), initially known as Hornisse (German "hornet"), was a German tank destroyer of World War II.  It was developed as an interim solution in 1942 by equipping a light turretless chassis with the Pak 43 heavy anti-tank gun.  Though only lightly armoured and displaying a high profile, it could frontally penetrate any Allied tank at long range, and its relatively low cost and superior mobility to heavier vehicles ensured it remained in production until the war's end.

Ernst Volckheim: Ernst Volckheim (11 April 1898 – 1 September 1962) was one of the founders of armored and mechanized warfare.  A German officer in the First and Second World War, Volkheim rose to the rank of colonel, during World War II in the German Army.  Little known outside of professional military and historical circles, Volkheim is considered the foremost military academic influence on German tank war proponent, Heinz Guderian, because both Volkheim's teaching as well as his 1924 professional military articles place him as one of the very earliest theorists of armored warfare and the use of German armored formations including independent tank corps.

Franz Bäke: Franz Bäke (28 February 1898 – 12 December 1978) was a German officer and tank commander during World War II.  He was a recipient of the Knight's Cross of the Iron Cross with Oak Leaves and Swords of Nazi Germany.  In the post-war popular culture, Bäke is one of the "panzer aces", that is, a highly decorated German tank commanders popularised in the English-language translations of the German author Franz Kurowski's "Panzer Aces" series.

Gepanzerter Mannschaftstransportwagen 'Kätzchen': The Gepanzerter Mannschaftstransportwagen Kätzchen ("Gep.  MTW Kätzchen") (German for kitten) was a German armoured personnel carrier of late World War II.  Auto-Union delivered two prototypes during 1944-45.  The hull's shape was similar to the hull of the "Panzerkampfwagen" Tiger II, but much smaller.  The vehicle had front wheel drive with five or six overlapping steel road wheels, possibly resembling the never-built E-25 "replacement tank"'s suspension system in appearance.  Power was provided by a Maybach HL50 engine.

Sturmpanzerwagen Oberschlesien: The Sturmpanzerwagen Oberschlesien ("Upper Silesia assault armoured wagon" from German: "der Sturm" , the storm, the assault; German: "der Panzer, gepanzert" the armour, armoured; German: "der Wagen" the vehicle, wagon) was a German tank project of the First World War.  It was a radical design for a fast-moving, lightly armored assault tank.

Supporting paragraphs: Gepanzerter Mannschaftstransportwagen 'Kätzchen' Tiger II
Answer: King Tiger