We've been at this house since 1999, and the pool was here when we bought the house, but this year is the first year that the pool has been invaded by frogs!  Big frogs!!  Luckily, they don't seem to like swimming with me any more than I like swimming with them and jump out as soon as I get in the water.  Last week though, one was doing opposite laps with me for a few laps.  I swam one way and they swam the other for about 4 laps before they got out.  I think they were just making fun of how slow I swim....