Of course there is. If a type foundry has sold you a font, but then says you can't share work you made using that font with other people even though the PDF file is identical to what they'd let you use in-house, that has an obvious and fairly direct comparison to the situation where a patent troll says you can't do something because although you have built an entire new thing they have a patent on some part of it and won't let you licence it. I see only two major differences:
1. You actually paid the type foundry money.
2. Even patent hoarders can get hit in some jurisdictions by things like compulsory licensing, FRAND obligations, or being legally unable to prevent someone from infringing on their patent, where one way or another they can't actually stop you from using the missing link.