Can apply mink oil on suede shoes?

In general, no. It can, but it will leave you with a slick, sort of oily finish, which won't really look like suede anymore. For suede, the only thing you can do is use the modern sort of waterproofing sprays: there's various compositions, some of which might devolve the dyes in brightly coloured suede, so you should probably go to your local shoe repair shop and ask what's right for you.