worrisome signs??

[herpdoc]

Hey,

A couple of questions about some behaviors my frogs are exhibiting periodically since I'm not super familiar with vet medicine (now people medicine is a different story) and the signs for disease/infection can be subtle. Ok first one. Every now and then my frogs (leopard frogs) will regurgitate their stomach contents. Wanted to know if this is something I should be concerned about; they will always manage to get their stomach back in but they sometimes spazz out in the process. Also, the frogs will keep one or both eyes depressed and hold it for several minutes (this is not in the context of feeding); not sure if this is normal. Lastly, sometimes the frogs will sort of slide around in the tank instead of hopping; they don't seem weak or limp. Thanks!