Link between skin cancer and moles/freckles?

Yes: Melanoma is a skin cancer starting from pigment producing cells called melanocytes. Moles which change color, have irregular borders, grow or bleed would be concerning features that mole has evolved into a melanoma. Best to see a dermatologist.

Link but uncommon: There are some rare genetic disorders where people have lots of moles or freckles and are more likely to develop skin cancer. However for most people the moles and freckles themselves do not increase their risk of getting a skin cancer, as other factors like sun exposure and sun sensitivity are more important.