Translation:I want a big elephant.
Yes. Masculine nouns on -ant/-ent tend do be inflected like "Elefant": der Migrant, der Dirigent, der Leutnant, der Delinquent, but also: der Bär,-en, der Prinz,-en, der Fürst,-en. Note: -ant/-ent are always stressed.
Here "Elefant" is accusative, right? and since it's of those weak nouns, "en" is added to the end of it?