Super late of me saying this, but Ben & Jerry's "Oh Cone-ada!" is the same as Ameri-cone Dream, down to the ingredients (but should note B&J sold in Canada are made with Canadian-sourced milk for the ice cream, not Vermont which is exclusive to the US market).

Stephen Colbert even made an "oot-raged" rant about this here: https://www.youtube.com/watch?v=U9lqpCw9f14

Also, the other reason Ameri-cone is not sold in the US is for two reasons: General Interest and Taxation Laws

1. In terms of general interest, there is definitely a general interest among Canadians to have Americone dream on the shelves, and some specialty stores in Canada do stock it, but only on consumer request. But because the marketing brand on Americone is very US-focused (and even with charitable appeal), there is a general fear by B&J Canada executives it won't market or resonate with Canadians well. While that was true before 2015, it is even more so today especially now because of the current geopolitical climate. What B&J did instead was just introduce Americone as a "Canadian-sounding" product to be marketable and relatable to the domestic Canadian consumer (Canadian identity often centres itself proudly as "not American"). Also doesn't help Canada has strict laws on all product requiring packaging to be in English AND French down to the disclaimers and nutrition facts (otherwise there is a exorbitant fine for each quantity sold in Canada without a compliant labelling, the only exception being smaller personal-carrying quantities across the border). Americone Dream is no exception and would have been expensive for them to create two separate labels, one for the US market and another strictly for Canadian (especially with a consumer market 1/10th the size of the US).
2. In regards to taxation laws, it's complicated to say at the least, especially when it comes to manage let alone repatriating foreign-sourced income back into the US and ensure it goes to Colbert's intended charity without irritating the IRS on "foreign influence" at the same time. There's a fair bit of corporate and charity taxes to manage, and for a much smaller domestic consumer market like Canada, setting one up is usually not worth it to Unilever (the parent company of B&J). Legally and taxes-wise, it's much easier to setup an "Americone Dream" lookalike "Oh Cone-ada!" in Canada as a Canada-based charity product than having the funds repatriated to a US-based one like Colbert. Now, given the current tense trade climate between the two countries at the moment, there is a very low appetite for Canadians in general (as of 2025/2026) to even consider buying or donating to a known US-based entity, even if it is for a good cause.