I have a cranberry recipe that calls for spice berries. Is that allspice or do I need something else?

Not sure.
it could be this shrub/minty leaf (defined, but seems unlikely see link) or could be allspice (yes, seems more likely).
https://www.thefreedictionary.com/Spice+berry
Do you have a link you could send us so we could give a more informed opinion?