Coming from the first tier of the 2020 Halloween Event, this pet is no longer obtainable in-game — the only way to get it now is through trading. Its look fits the event theme and it works fine as a cheap seasonal add-in. Value has stayed stable with no notable moves in either direction.
Pumpkin (2020) is a Common pet in Murder Mystery 2. Its combined value is <0.1, #272 of 335 common items and #1090 of 921 valued items overall. Demand is very low: it sits in inventories for a while, and buyers often ask for a discount.
Closest in value: Balloons (<0.1), Bat (2019) (<0.1), Bells (<0.1). Use them as a benchmark for a fair one-for-one trade.
Value history
What it is worth in other items
How many of each item equal one Pumpkin (2020) by value. Demand differs between items, so check it before you trade.