Are there market makers for OTC stocks?

Probably not.

OTC markets (also known as 'Pink Sheets') tend to have names that do not meet the listing criteria for larger exchanges. As a result there is less liquidity and less incentives for market makers to participate in those names.

That is not to say that market makers won't make markets in the name, they may choose to do so. The OTC markets may adopt schemes to encourage market makers to make markets, but it is unlikely there would be a guarantee that there would be market makers willing to make markets in such a name with a reasonable spread.