Recently I saw categories/groups under T-shirt section on Amazon, that had categories such as: "Retro with a bunch of Nintendo designs / 80's with Celebrity prints from that time / Movies with a bunch of movie characters and comics / and etc.." All those items had copyrighted or trade marked designs on them.
So I thought MBA had a licensed catalog that allowed creators to use these TM designs..
I've contacted MBA support, and this is what I got, let's vote for this feature guys!
That what I got from the MBA support:
"Hello from Amazon Selling Partner Support,
I understand you have contacted us inquiring about access to a catalog of approved TM's that Content Creators have access to.
Thank you for your email. That feature is not available through our portal. You can file a feature request in our forum by selecting to create an idea in the Merch by Amazon feature request space"