What is the shabdroop of falam in sanskrit?

The word "falam" (फलम्) in Sanskrit doesn't have a separate shabdroop (declension). It is the nominative singular form of the word "phal" (फल), which means fruit.

Here's the shabdroop of "phal" (फल):

Singular

* Nominative: phal फलम्

* Accusative: phalam फलम्

* Instrumental: phalena फलेन

* Dative: phalaya फलाय

* Ablative: phalat फलात्

* Genitive: phalasya फलस्य

* Locative: phile फले

Plural

* Nominative: phalanī फलानि

* Accusative: phalanī फलानि

* Instrumental: phalaih फलैः

* Dative: phalebhyas फलैभ्यः

* Ablative: phalebhyas फलैभ्यः

* Genitive: phalānām फलानाम्

* Locative: phalēshu फलेषु

So, "falam" is just the singular nominative form of "phal".