Baby Issak eating his first cherry tomato. Question by Nicole: Can guinea pigs eat cucumbers and/or tomatoes? My mom picked this HUGE cucumber from her garden and I was wondering if I could feed some of it to my 2 guinea pigs, Oreo and Resse. Also she always has a bucnh of little cherry tomatoes, can I feed that to them too? Best answer: Answer by RoseYes…just make sure they are washed really well. Know better? Leave your own answer in the comments! More Cherry Tomato Articles