They can ally with the other free peoples of Eriador so Rivendell, the grey havens, the blue mountains, the grey company, the wanderers in the wild, the wizards and Breelanders. You could stretch the lore that far to be sure since the hobbits had, to a limited extent, trade with dwarves and the Breelanders and some of them were on speaking terms with elves. If the shire would have been threatened with open invasion during the third age it is likely for some or all of the above mentioned groups would have sent help.
There were also hobbits in Bree and the Chetwood who we don't know much about. Making them a great place to go to add hobbits as allies to another list. Though I don't think you could get a whole Hobbit army out of the Breeland population.
I would say your best bet lore wise would be a Breeland militia of sorts with lake town militia taking the part of Bree's humans. Then add some hobbits and a small company of dwarven merchants or mercenaries. That would make a pretty plausible list lore wise since bandits and worse attacked Bree and the surrounding lands during the War of the Ring.
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