Is it common to have multiple recessive traits in humans?
It depends on how long a population in your dominant heritage was genetically isolated, how common certain recessive traits are.

However, you might reconsider about the "green eyes".  Iridologists claim that there are only blue eyes, and light brown eyes.  All other colours are indicative of bioaccumulation of various substances (evidenced by a return to blue or light brown when the body is supported in excreting these substances), and health issues in certain tissues.

While there is argument about how scientific a technique iridology is, all medicine begins as observation of patterns, and development of models based on those patterns.  Models in medicine are constantly undergoing upgrading and replacement, as old models no longer explain new and well-observed patterns.