Various examples of whistle spoons can be found, particularly in the netherlands
2 examples of whistle spoons – both have lost the stem/bowl of the find – which can be common in soil finds due to the more fragile nature of the stem in the Rotterdam museum. Both spoons are dated to the 1350- 1450 time period and are made of lead pewter
https://bodemvondsten.rotterdam.nl/objecten/?_object=fluitjeslepel
In this Article from the Dutch Tin Association, whistle spoons are talked about in detail, including a whistle spoon found whole, expected to be dated around 1280. It also have several fragments, including one of the two in the Rotterdam museum.
16th Century English – Pewter