Could be Grey's, if they start climbing around the enclosure when metamorphosed to frogs, you predicted outcome right. If kids undertand they are amphibians and delicate, etc. the White's Tree Frog - Litoria caerulea are probably one of the most tolerant. Anyone handling frogs must wash hands before and rinse with dechlorinated water. Washing hands again after handling is recommended too. All info you need is in the care article linked. Good luck !