The basic synopsis of these is pretty self-explanatory, mostly due to the lack of information currently known about either, but before Greg retired in 2006, The Wiggles had filmed parts of both Getting Strong and the Wiggle and Learn TV series.
Only two videos, and two other promotional images have been released from either of these (only 1 of which relates specifically to the series); Getting Strong! and Smell Your Way Through The Day were released as bonuses on the iTunes version of Hits And Rarities, with the digital booklet also containing a picture of A Frog Went A Walking, and in 2015, The Wiggles’ Facebook teased a documentary for the 25th Anniversary to focus on these unfinished projects started with Greg, but finished with Sam. However, this documentary seems to have been cancelled. This could be why The Wiggles decided to release a reunion show instead. In addition, a shortened version of We're All Friends released in the audio CD of a book of the same name most likely came from this period of filming, and if so it would have likely been used in one or both of these.
They both used sets and backdrops, unlike the final versions with Sam where green screen/blue screen is used. The original sets and backdrops of TV Series 6 can be found on the Wiggles' first ever documentary: Happy 15th Birthday!. The audio is unfinished, with vocals being performed by Greg on set to basic, unfinished backing tracks. The Hit Songs and Rarities CD contains a proper version of Getting Strong performed by Greg, but it was recorded in 2012, simulating what it would have been like had the project continued with him in 2006/2007. The rumor says that the footage is actually from a private showreel.
However, both of the rarities are related to one thing, The Wiggles' rendition of the ABC Kids song ident, a project that was also from 2006 and actually finished to promote the children's channel block. That song featured Greg Page as the yellow Wiggle and hand-drawn backgrounds. It was re-recorded as "Wiggle and Learn" in 2007, with Sam Wiggle.
Link to Smell Your Way: https://www.youtube.com/watch?v=jN-fgLatTxk