Is Lamm der, die or das?

The correct German article for Lamm is das. The noun Lamm is Neuter. So you always say: das Lamm. Learn the article together with the noun — German nouns don't follow predictable gender rules most of the time.

The plural of Lamm is: die Lämmer. In the plural, every German noun takes the article "die". So: die Lämmer. Example: ein Lamm → zwei Lämmer.

Correct: die Lämmer. The form "die Lamms" is wrong. The plural of das Lamm is die Lämmer. In the nominative plural, you always use the article "die".

das Lamm follows the four German cases. Nominative: das Lamm, Accusative: das Lamm, Dative: dem Lamm, Genitive: des Lammes. In plural: die Lämmer / den Lämmern. Learn these forms together with the noun.

The genitive singular of das Lamm is: des Lammes. The genitive plural is der Lämmer. German uses the genitive to express possession or belonging. Example: die Farbe des Lammes.

The dative plural of Lamm is: den Lämmern. In German, dative plural nouns usually end in "-n". So you say: "mit den Lämmern". Use this case after prepositions like mit, von, bei, zu.

Lamm is a noun and must be capitalized in German. You'll find example sentences above for each case. The article das stays the same in nominative singular but changes in other cases. Practice declension in your own sentences.

Yes, Lamm is a noun (also called a substantive). German nouns are always capitalized. The article for Lamm is das. Every German noun has a fixed article you must memorize.