Toxrill's slug tokens and Ogre Slumlord's vanilla rat tokens are just consolation prizes compared to Vren's super-rats anyway. Their tokens are nice backup if Vren isn't on the battlefield, but their ♍other abilities are important enough that it doesn't hurt you when Vren's tokens♏ replace theirs.

EDIT: oh, and Slumlord also makes rat tokens when your own nontoken cr🍸eatu🐻res die.