Form your non-dominant hand into a fist with the palm facing down to represent the pumpkin. With your dominant hand, touch your middle finger to your thumb to form an '8' handshape. Flick your middle finger against the back of your non-dominant hand a couple of times, as if you are thumping a pumpkin to check if it is ripe.
Sign 'pumpkin', then mimic carving a shape with an imaginary knife, followed by the sign for 'Halloween'.
Sign 'pumpkin' and then 'pie', followed by pointing to yourself and signing 'love' with a happy facial expression.
Sign 'pumpkin', then use your hands to outline a massive round shape in the air while puffing out your cheeks to emphasize the size.
Sign 'pumpkin', then mimic carving a shape with an imaginary knife, followed by the sign for 'Halloween'.
Sign 'pumpkin' and then 'pie', followed by pointing to yourself and signing 'love' with a happy facial expression.
Sign 'pumpkin', then use your hands to outline a massive round shape in the air while puffing out your cheeks to emphasize the size.
They are very similar and often use the exact same motion! Context usually makes it clear. However, some signers use an initialized 'P' handshape specifically for pumpkin, while 'melon' might use an 'M' or the standard '8' handshape flick.
Just a light, gentle flick is perfect. You don't need to actually thump your hand hard enough to make a loud noise or cause discomfort. The visual motion is what matters.
In ASL, the standard sign uses the middle finger (an '8' handshape) to flick. Using the index finger changes the handshape and might make the sign look unnatural to fluent signers.
