Why do you want to add them to the mash? Fruit already has plenty of sugar that doesn't need to be converted. Adding fruit to the mash (or at any point before primary fermentation is done) will add some sugar to the wort, but most of the fruit flavor/aroma will get blown off during the fermentation (and during the boil if you add it to the mash).
Most commercial pumpkin ales don't even contain pumpkin
and adding pumpkin to the mash of a pumpkin ale doesn't add any pumpkin flavor to the beer!
The pumpkin flavor in a pumpkin ale comes from the spices added near the end of the boil.
What adding the pumpkin to the mash DOES add to the beer is the proteins from the pumpkin, which give the beer a thicker mouthfeel and adds a protein to the beer that gives it a similar mouthfeel as the proteins in a wheat or rye.
The TASTE of actual pumpkin IS NOT characteristic of a pumpkin beer, it's pumpkin pie spices that characterize a pumpkin beer, and the pumpkin itself is very optional!
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