Thanks everyone! I'm sorry I wasn't more specific in my original post...I was indeed referring to earthworms! While my frog does enjoy wax worms, mealworms, hornworms and such, those his occasional 'goodies' that are thrown in for variety, nothing I need to really stock up on...although, those tips may help them last a bit longer!

Sandy...that was precisely the info I was looking for, thank you so much! I really think I"m going to give it a try here soon!