Yes! Tutors manage their own rates and can change them at any time with your approval. Some tutors set specific rates for group or online lessons. Tutors can opt to include this information on their profiles but are not required to do so. You should feel free to message a tutor with any questions you might have about their rates.
Please note that if you have already held a lesson or exchanged messages with a tutor, you will be locked into the rate that was posted on their profile at the time communication was established. The tutor will have to request approval of a rate change before their hourly rate with you can be changed.